curl and libcurl 7.73.0

 Public curl releases:         195
 Command line options:         232
 curl_easy_setopt() options:   277
 Public functions in libcurl:  82
 Contributors:                 2242

This release includes the following changes:

 o curl: support XDG_CONFIG_HOME to find .curlrc [3]
 o CURLE_PROXY: new error code [7]
 o sftp: add new quote commands 'atime' and 'mtime' [6]

This release includes the following bugfixes:

 o checksrc: verify do-while and spaces between the braces [2]
 o dist: add missing CMake Find modules to the distribution [14]
 o etag: save and use the full received contents [4]
 o Makefile.m32: add ability to override zstd libs [ci skip] [10]
 o runtests: clear pid variables when failing to start a server [12]
 o runtests: make cleardir() erase dot files too [8]
 o setopt: if the buffer exists, refuse the new BUFFERSIZE [5]
 o tls: provide the CApath verbose log on its own line [1]

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:

  Andrew Barnes, Christian Weisgerber, COFFEETALES on github, Daniel Stenberg,
  Don J Olmstead, Eli Schwartz, Harry Sintonen, jmdavitt on github, Ray Satiro,
  Viktor Szakats,
  (10 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
 [10] = https://curl.haxx.se/bug/?i=5840
 [12] = https://curl.haxx.se/mail/lib-2020-08/0018.html
 [14] = https://curl.haxx.se/bug/?i=5836