Curl and libcurl 7.55.0

 Public curl releases:         167
 Command line options:         207
 curl_easy_setopt() options:   245
 Public functions in libcurl:  61
 Contributors:                 1571

This release includes the following changes:

 o 

This release includes the following bugfixes:

 o includes: remove curl/curlbuild.h and curl/curlrules.h [1]
 o dist: make the hugehelp.c not get regenerated unnecessarily [2]
 o timers: store internal time stamps as time_t instead of doubles [3]
 o progress: let "current speed" be UL + DL speeds combined [4]
 o http-proxy: do the HTTP CONNECT process entirely non-blocking [5]

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:

  Daniel Stenberg, Marcel Raad, Paul Harris, Ray Satiro, Simon Warta,
  (5 contributors)

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

References to bug reports and discussions on issues:

 [1] = https://daniel.haxx.se/blog/2017/06/15/target-independent-libcurl-headers/
 [2] = https://curl.haxx.se/bug/?i=1565
 [3] = https://curl.haxx.se/bug/?i=1531
 [4] = https://curl.haxx.se/bug/?i=1556
 [5] = https://curl.haxx.se/bug/?i=1547