Curl and libcurl 7.47.0

 Public curl releases:         151
 Command line options:         179
 curl_easy_setopt() options:   221
 Public functions in libcurl:  61
 Contributors:                 1340

This release includes the following changes:

 o version: Add flag CURL_VERSION_PSL for libpsl
 o http: added CURL_HTTP_VERSION_2TLS to do HTTP/2 for HTTPS only [8]
 o curl: use 2TLS by default
 o curl --expect100-timeout: added [10]

This release includes the following bugfixes:

 o tests: Disable the OAUTHBEARER tests when using a non-default port number [1]
 o curl: remove keepalive #ifdef checks done on libcurl's behalf
 o formdata: Check if length is too large for memory [2]
 o lwip: Fix compatibility issues with later versions [3]
 o openssl: BoringSSL doesn't have CONF_modules_free
 o config-win32: Fix warning HAVE_WINSOCK2_H undefined
 o build: fix compilation error with CURL_DISABLE_VERBOSE_STRINGS [4]
 o http2: Fix hanging paused stream [5]
 o scripts/Makefile: fix GNUism and survive no perl [6]
 o openssl: adapt to 1.1.0+ name changes
 o openssl: adapt to openssl >= 1.1.0 X509 opaque structs [7]
 o HTTP2.md: spell fix and remove TODO now implemented
 o setstropt: const-correctness [9]
 o cyassl: fix compiler warning on type conversion
 o gskit: Fix host subject altname verification [11]

This release includes the following known bugs:

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

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

  Anders Bakken, Christian Stewart, Daniel Stenberg, Francisco Moraes,
  Gisle Vanem, John Kohl, Kamil Dudka, Patrick Monnerat, Ray Satiro,
  Steve Holme, Tatsuhiro Tsujikawa, Thomas Klausner,
  (12 contributors)

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

References to bug reports and discussions on issues:

 [1] = http://curl.haxx.se/mail/lib-2015-12/0003.html
 [2] = https://github.com/bagder/curl/issues/425#issuecomment-154518679
 [3] = http://curl.haxx.se/mail/lib-2015-12/0023.html
 [4] = http://curl.haxx.se/bug/?i=558
 [5] = http://curl.haxx.se/mail/lib-2015-11/0103.html
 [6] = http://curl.haxx.se/bug/?i=555
 [7] = http://curl.haxx.se/bug/?i=491
 [8] = http://curl.haxx.se/libcurl/c/CURLOPT_HTTP_VERSION.html
 [9] = http://curl.haxx.se/bug/?i=565
 [10] = http://curl.haxx.se/docs/manpage.html#--expect100-timeout
 [11] = http://curl.haxx.se/mail/lib-2015-12/0062.html
