curl and libcurl 7.73.0

 Public curl releases:         195
 Command line options:         234
 curl_easy_setopt() options:   278
 Public functions in libcurl:  85
 Contributors:                 2270

This release includes the following changes:

 o curl: add --output-dir [25]
 o curl: support XDG_CONFIG_HOME to find .curlrc [3]
 o curl: update --help with categories [77]
 o curl_easy_option_*: new API for meta-data about easy options [40]
 o CURLE_PROXY: new error code [7]
 o mqtt: enable by default [28]
 o sftp: add new quote commands 'atime' and 'mtime' [6]
 o ssh: add the option CURLKHSTAT_FINE_REPLACE [27]
 o tls: add CURLOPT_SSL_EC_CURVES and --curves [29]

This release includes the following bugfixes:

 o altsvc: clone setting in curl_easy_duphandle [60]
 o base64: also build for smtp, pop3 and imap [81]
 o BUGS: convert document to markdown [107]
 o build-wolfssl: fix build with Visual Studio 2019 [114]
 o buildconf: invoke 'autoreconf -fi' instead [37]
 o checksrc: detect // comments on column 0 [132]
 o checksrc: verify do-while and spaces between the braces [2]
 o checksrc: warn on space after exclamation mark [129]
 o CI/azure: disable test 571 in the msys2 builds [93]
 o CI/azure: MQTT is now enabled by default [64]
 o CI/azure: no longer ignore results of test 1013 [43]
 o CI/tests: fix invocation of tests for CMake builds [117]
 o CI/travis: add a CI job with openssl3 (from git master) [51]
 o cleanups: avoid curl_ on local variables [53]
 o CMake: add option to enable Unicode on Windows [48]
 o cmake: make HTTP_ONLY also disable MQTT [58]
 o CMake: remove explicit `CMAKE_ANSI_CFLAGS` [45]
 o cmake: remove scary warning [96]
 o cmdline-opts/gen.pl: generate nicer "See Also" in curl.1 [66]
 o configure: don't say HTTPS-proxy is enabled when disabled [120]
 o configure: fix pkg-config detecting wolfssl [26]
 o configure: let --enable-debug set -Wenum-conversion with gcc >= 10 [56]
 o conn: check for connection being dead before reuse [39]
 o connect.c: remove superfluous 'else' in Curl_getconnectinfo [42]
 o curl.1: add see also no-progress-meter on two spots [67]
 o curl.1: fix typo invokved -> invoked [36]
 o curl: in retry output don't call all problems "transient" [74]
 o curl: make --libcurl show binary posts correctly [130]
 o curl: make checkpasswd use dynbuf [100]
 o curl: make file2memory use dynbuf [102]
 o curl: make file2string use dynbuf [103]
 o curl: make glob_match_url use dynbuf [101]
 o curl: make sure setopt CURLOPT_IPRESOLVE passes on a long [134]
 o curl: retry delays in parallel mode no longer sleeps blocking [70]
 o curl: use curlx_dynbuf for realloc when loading config files [73]
 o curl:parallel_transfers: make sure retry readds the transfer [71]
 o curl_get_line: build only if cookies or alt-svc are enabled [13]
 o curl_mime_headers.3: fix the example's use of curl_slist_append [83]
 o Curl_pgrsTime - return new time to avoid timeout integer overflow [32]
 o Curl_send: return error when pre_receive_plain can't malloc [111]
 o dist: add missing CMake Find modules to the distribution [14]
 o docs/LICENSE-MIXING: remove [79]
 o docs/opts: fix typos in two manual pages [119]
 o docs/RESOURCES: remove [105]
 o docs/TheArtOfHttpScripting: convert to markdown [106]
 o docs: add description about CI platforms to CONTRIBUTE.md [44]
 o docs: correct non-existing macros in man pages [35]
 o doh: add error message for DOH_DNS_NAME_TOO_LONG [17]
 o dynbuf: make sure Curl_dyn_tail() zero terminates [78]
 o easy_reset: clear retry counter [82]
 o easygetopt: pass a valid enum to avoid compiler warning [75]
 o etag: save and use the full received contents [4]
 o ftp: a 550 response to SIZE returns CURLE_REMOTE_FILE_NOT_FOUND [99]
 o ftp: avoid risk of reading uninitialized integers [76]
 o ftp: get rid of the PPSENDF macro [85]
 o ftp: make a 552 response return CURLE_REMOTE_DISK_FULL [87]
 o ftp: separate FTPS from FTP over "HTTPS proxy" [112]
 o git: ignore libtests in 3XXX area [16]
 o github: use new issue template feature [88]
 o HISTORY: mention alt-svc added in 2019
 o HTTP/3: update to OpenSSL_1_1_1g-quic-draft-29 [41]
 o http: consolidate nghttp2_session_mem_recv() call paths [80]
 o http_proxy: do not count proxy headers in the header bytecount [90]
 o http_proxy: do not crash with HTTPS_PROXY and NO_PROXY set [50]
 o imap: make imap_send use dynbuf for the send buffer management [110]
 o imap: set cselect_bits to CURL_CSELECT_IN initially [104]
 o ldap: reduce the amount of #ifdefs needed [124]
 o lib/Makefile.am: bump VERSIONINFO due to new functions [65]
 o lib1560: verify "redirect" to double-slash leading URL [20]
 o lib583: fix enum mixup
 o lib: fix -Wassign-enum warnings [84]
 o lib: make Curl_gethostname accept a const pointer [38]
 o libssh2: handle the SSH protocols done over HTTPS proxy [125]
 o libssh2: pass on the error from ssh_force_knownhost_key_type [47]
 o Makefile.m32: add ability to override zstd libs [ci skip] [10]
 o man pages: switch to https://example.com URLs [86]
 o MANUAL: update examples to resolve without redirects [122]
 o mbedtls: add missing header when defining MBEDTLS_DEBUG [133]
 o memdebug: remove 9 year old unused debug function [126]
 o multi: expand pre-check for socket readiness [21]
 o multi: handle connection state winsock events [31]
 o multi: implement wait using winsock events [22]
 o ngtcp2: adapt to new NGTCP2_PROTO_VER_MAX define [108]
 o ngtcp2: adapt to the new pkt_info arguments [18]
 o ntlm: fix condition for curl_ntlm_core usage [46]
 o openssl: avoid error conditions when importing native CA [52]
 o openssl: consider ALERT_CERTIFICATE_EXPIRED a failed verification [57]
 o openssl: Fix wincrypt symbols conflict with BoringSSL [9]
 o parsedate: tune the date to epoch conversion [95]
 o pause: only trigger a reread if the unpause sticks [92]
 o pingpong: use a dynbuf for the *_pp_sendf() function [113]
 o READMEs: convert several to markdown [115]
 o runtests: add %repeat[]% for test files [116]
 o runtests: allow creating files without newlines [72]
 o runtests: allow generating a binary sequence from hex
 o runtests: clear pid variables when failing to start a server [12]
 o runtests: make cleardir() erase dot files too [8]
 o runtests: provide curl's version string as %VERSION for tests [127]
 o schannel: fix memory leak when using get_cert_location [15]
 o schannel: return CURLE_PEER_FAILED_VERIFICATION for untrusted root [128]
 o scripts: improve the "get latest curl release tag" logic
 o sectransp: make it build with --disable-proxy [123]
 o select.h: make socket validation macros test for INVALID_SOCKET [24]
 o select: align poll emulation to return all relevant events [63]
 o select: fix poll-based check not detecting connect failure
 o select: reduce duplication of Curl_poll in Curl_socket_check [23]
 o select: simplify return code handling for poll and select [49]
 o setopt: if the buffer exists, refuse the new BUFFERSIZE [5]
 o setopt: return CURLE_BAD_FUNCTION_ARGUMENT on bad argument [91]
 o socketpair: allow CURL_DISABLE_SOCKETPAIR [11]
 o sockfilt: handle FD_CLOSE winsock event on write socket [30]
 o src: spell whitespace without whitespace [121]
 o SSLCERTS: fix English syntax [34]
 o strerror: honor Unicode API choice on Windows [109]
 o symbian: drop support [118]
 o telnet.c: depend on static requirement of WinSock version 2 [61]
 o test1541: remove since it is a known bug [68]
 o test163[12]: require http to be built-in to run [94]
 o test434: test -K use in a single line without newline [59]
 o test971: show test mismatches "inline"
 o tests/data: Fix some mismatched XML tags in test cases
 o tests/FILEFORMAT: document nonewline support for <file>
 o tests/FILEFORMAT: document type=shell for <command>
 o tests/server/util.c: fix support for Windows Unicode builds [131]
 o tests: remove pipelining tests [69]
 o tls: fix SRP detection by using the proper #ifdefs [33]
 o tls: provide the CApath verbose log on its own line [1]
 o tool_setopt: escape binary data to hex, not octal
 o tool_writeout: add new writeout variable, %{num_headers} [97]
 o travis: add a build using libressl (from git master) [55]
 o url: use blank credentials when using proxy w/o username and password [54]
 o urlapi: use more Curl_safefree [89]
 o vtls: deduplicate client certificates in ssl_config_data [98]
 o win32: drop support for WinSock version 1, require version 2 [62]
 o winbuild: convert the instruction text to README.md [19]

This release includes the following known bugs:

 o see docs/KNOWN_BUGS (https://curl.haxx.se/docs/knownbugs.html)

This release would not have looked like this without help, code, reports and
advice from friends like these:

  Alessandro Ghedini, Anders Bakken, Andrew Barnes, anio on github,
  Antarpreet Singh, beckenc on github, Chris Paulson-Ellis,
  Christian Weisgerber, COFFEETALES on github, Dan Fandrich, Daniel Gustafsson,
  Daniel Stenberg, Dan Kenigsberg, Diven Qi, Don J Olmstead, Duncan Wilcox,
  Eli Schwartz, Emil Engler, Eric Curtin, Frederik Wedel-Heinen,
  fullincome on github, Gaurav Malhotra, Gergely Nagy, Gisle Vanem,
  Harry Sintonen, htasta on github, iammrtau on github, ihsinme on github,
  Ionuț-Francisc Oancea, Javier Blazquez, Javier Navarro, Jeroen Ooms,
  jmdavitt on github, Kamil Dudka, Kunal Chandarana, Laramie Leavitt,
  Marcel Raad, Marc Hörsken, Martin Bašti, Michael Baentsch, Michael Musset,
  Michael Olbrich, Mingtao Yang, M.R.T on github, Peter Körner, Peter Wu,
  Quentin Balland, Rasmus Melchior Jacobsen, Ray Satiro, rcombs on github,
  Robin Douine, Samanta Navarro, Samuel Marks, Samuel Tranchet, Sergei Nikulov,
  sofaboss on github, Stefan Strogin, Stephan Mühlstrasser,
  Tatsuhiro Tsujikawa, Tomas Berger, Tom van der Woerdt, Viktor Szakats,
  xwxbug on github,
  (63 contributors)

        Thanks! (and sorry if I forgot to mention someone)

References to bug reports and discussions on issues:

 [1] = https://curl.haxx.se/bug/?i=5826
 [2] = https://curl.haxx.se/bug/?i=5845
 [3] = https://curl.haxx.se/bug/?i=5829
 [4] = https://curl.haxx.se/bug/?i=5610
 [5] = https://curl.haxx.se/bug/?i=5842
 [6] = https://curl.haxx.se/bug/?i=5810
 [7] = https://curl.haxx.se/bug/?i=5770
 [8] = https://curl.haxx.se/bug/?i=5838
 [9] = https://curl.haxx.se/bug/?i=5669
 [10] = https://curl.haxx.se/bug/?i=5840
 [11] = https://curl.haxx.se/bug/?i=5850
 [12] = https://curl.haxx.se/mail/lib-2020-08/0018.html
 [13] = https://curl.haxx.se/bug/?i=5851
 [14] = https://curl.haxx.se/bug/?i=5836
 [15] = https://curl.haxx.se/bug/?i=5855
 [16] = https://curl.haxx.se/bug/?i=5859
 [17] = https://curl.haxx.se/bug/?i=5863
 [18] = https://curl.haxx.se/bug/?i=5864
 [19] = https://curl.haxx.se/bug/?i=5861
 [20] = https://curl.haxx.se/bug/?i=5849
 [21] = https://curl.haxx.se/bug/?i=5634
 [22] = https://curl.haxx.se/bug/?i=5634
 [23] = https://curl.haxx.se/bug/?i=5707
 [24] = https://curl.haxx.se/bug/?i=5760
 [25] = https://curl.haxx.se/bug/?i=5637
 [26] = https://curl.haxx.se/bug/?i=5848
 [27] = https://curl.haxx.se/bug/?i=5685
 [28] = https://curl.haxx.se/bug/?i=5858
 [29] = https://curl.haxx.se/bug/?i=5892
 [30] = https://curl.haxx.se/bug/?i=5879
 [31] = https://curl.haxx.se/bug/?i=5867
 [32] = https://curl.haxx.se/bug/?i=5583
 [33] = https://curl.haxx.se/bug/?i=5865
 [34] = https://curl.haxx.se/bug/?i=5876
 [35] = https://curl.haxx.se/bug/?i=5846
 [36] = https://curl.haxx.se/bug/?i=5846
 [37] = https://curl.haxx.se/bug/?i=5853
 [38] = https://curl.haxx.se/bug/?i=5866
 [39] = https://curl.haxx.se/bug/?i=5884
 [40] = https://curl.haxx.se/bug/?i=5365
 [41] = https://curl.haxx.se/bug/?i=5871
 [42] = https://curl.haxx.se/bug/?i=5912
 [43] = https://curl.haxx.se/bug/?i=5889
 [44] = https://curl.haxx.se/bug/?i=5882
 [45] = https://curl.haxx.se/bug/?i=5439
 [46] = https://curl.haxx.se/bug/?i=1262
 [47] = https://curl.haxx.se/bug/?i=5909
 [48] = https://curl.haxx.se/bug/?i=5843
 [49] = https://curl.haxx.se/bug/?i=5880
 [50] = https://bugzilla.redhat.com/1873327
 [51] = https://curl.haxx.se/bug/?i=5908
 [52] = https://curl.haxx.se/bug/?i=5907
 [53] = https://curl.haxx.se/bug/?i=5906
 [54] = https://curl.haxx.se/bug/?i=5914
 [55] = https://curl.haxx.se/bug/?i=5932
 [56] = https://curl.haxx.se/bug/?i=5930
 [57] = https://curl.haxx.se/bug/?i=5934
 [58] = https://curl.haxx.se/bug/?i=5931
 [59] = https://curl.haxx.se/bug/?i=5946
 [60] = https://curl.haxx.se/bug/?i=5923
 [61] = https://curl.haxx.se/bug/?i=5854
 [62] = https://curl.haxx.se/bug/?i=5854
 [63] = https://curl.haxx.se/bug/?i=5883
 [64] = https://curl.haxx.se/bug/?i=5903
 [65] = https://curl.haxx.se/bug/?i=5899
 [66] = https://curl.haxx.se/bug/?i=5898
 [67] = https://curl.haxx.se/bug/?i=5897
 [68] = https://curl.haxx.se/bug/?i=5922
 [69] = https://curl.haxx.se/bug/?i=5921
 [70] = https://curl.haxx.se/bug/?i=5917
 [71] = https://curl.haxx.se/bug/?i=5905
 [72] = https://curl.haxx.se/bug/?i=5946
 [73] = https://curl.haxx.se/bug/?i=5946
 [74] = https://curl.haxx.se/bug/?i=5916
 [75] = https://github.com/curl/curl/commit/6ebe63fac23f38df911edc348e8ccc72280f9434#commitcomment-42042843
 [76] = https://curl.haxx.se/bug/?i=5972
 [77] = https://curl.haxx.se/bug/?i=5680
 [78] = https://curl.haxx.se/bug/?i=5959
 [79] = https://curl.haxx.se/bug/?i=5955
 [80] = https://curl.haxx.se/bug/?i=5648
 [81] = https://curl.haxx.se/bug/?i=5937
 [82] = https://curl.haxx.se/bug/?i=5974
 [83] = https://curl.haxx.se/bug/?i=5942
 [84] = https://github.com/curl/curl/commit/879007f8118771f4896334731aaca5850a154675#commitcomment-42087553
 [85] = https://curl.haxx.se/bug/?i=5971
 [86] = https://curl.haxx.se/bug/?i=5969
 [87] = https://curl.haxx.se/bug/?i=6016
 [88] = https://curl.haxx.se/bug/?i=5936
 [89] = https://curl.haxx.se/bug/?i=5968
 [90] = https://curl.haxx.se/bug/?i=5992
 [91] = https://curl.haxx.se/bug/?i=5993
 [92] = https://curl.haxx.se/mail/lib-2020-09/0081.html
 [93] = https://curl.haxx.se/bug/?i=5954
 [94] = https://curl.haxx.se/bug/?i=6014
 [95] = https://curl.haxx.se/bug/?i=5985
 [96] = https://curl.haxx.se/bug/?i=5984
 [97] = https://curl.haxx.se/bug/?i=5947
 [98] = https://curl.haxx.se/bug/?i=5629
 [99] = https://curl.haxx.se/bug/?i=5953
 [100] = https://curl.haxx.se/bug/?i=5952
 [101] = https://curl.haxx.se/bug/?i=5952
 [102] = https://curl.haxx.se/bug/?i=5952
 [103] = https://curl.haxx.se/bug/?i=5952
 [104] = https://curl.haxx.se/bug/?i=5961
 [105] = https://curl.haxx.se/bug/?i=5980
 [106] = https://curl.haxx.se/bug/?i=5981
 [107] = https://curl.haxx.se/bug/?i=5979
 [108] = https://curl.haxx.se/bug/?i=6012
 [109] = https://curl.haxx.se/bug/?i=6005
 [110] = https://curl.haxx.se/bug/?i=6010
 [111] = https://curl.haxx.se/bug/?i=6011
 [112] = https://curl.haxx.se/bug/?i=5523
 [113] = https://curl.haxx.se/bug/?i=6004
 [114] = https://curl.haxx.se/bug/?i=6033
 [115] = https://curl.haxx.se/bug/?i=6028
 [116] = https://curl.haxx.se/bug/?i=6040
 [117] = https://curl.haxx.se/bug/?i=6052
 [118] = https://curl.haxx.se/bug/?i=5989
 [119] = https://curl.haxx.se/bug/?i=6039
 [120] = https://github.com/curl/curl/pull/5735#issuecomment-701376388
 [121] = https://curl.haxx.se/bug/?i=6023
 [122] = https://curl.haxx.se/bug/?i=6024
 [123] = https://curl.haxx.se/bug/?i=6025
 [124] = https://curl.haxx.se/bug/?i=6035
 [125] = https://curl.haxx.se/bug/?i=4295
 [126] = https://curl.haxx.se/bug/?i=5973
 [127] = https://curl.haxx.se/bug/?i=6037
 [128] = https://curl.haxx.se/bug/?i=6003
 [129] = https://curl.haxx.se/bug/?i=6034
 [130] = https://curl.haxx.se/bug/?i=6031
 [131] = https://curl.haxx.se/bug/?i=6070
 [132] = https://curl.haxx.se/bug/?i=6048
 [133] = https://curl.haxx.se/bug/?i=6045
 [134] = https://curl.haxx.se/bug/?i=6042