As this is mandated by the http2 spec draft-09

This patch chooses different approach to integrate HTTP2 into HTTP curl
stack. The idea is that we insert HTTP2 layer between HTTP code and
socket(TLS) layer. When HTTP2 is initialized (either in NPN or Upgrade),
we replace the Curl_recv/Curl_send callbacks with HTTP2's, but keep the
original callbacks in http_conn struct. When sending serialized data by
nghttp2, we use original Curl_send callback. Likewise, when reading data
from network, we use original Curl_recv callback. In this way we can
treat both TLS and non-TLS connections.

With this patch, one can transfer contents from https://twitter.com and
from nghttp2 test server in plain HTTP as well.

The code still has rough edges. The notable one is I could not figure
out how to call nghttp2_session_send() when underlying socket is
writable.

... and then go through the "normal" HTTP engine.

Check the NPN result before preparing an HTTP request and switch into
HTTP/2.0 mode if necessary. This is a work in progress, the actual code
to prepare and send the request using nghttp2 is still missing from
Curl_http2_send_request().

To better reflect its purpose

This makes it easier to trace what's happening.

the number of elements in the 'nghttp2_session_callbacks' structure is
now reduced by 2 in version 0.3.0 (I'm not sure when the change
happened, but checking for ver 0.3.0 work for me).

Something is wrong in 'userp' for the HTTP2 recv_callback().  The
session is created using bogus user-data; '&conn' and not 'conn'.

I noticed this since the socket-value in Curl_read_plain() was set to a
impossible high value.

... instead of HTTP/2.0 to work fine with the nghttpx proxy/server.

This function was modified in nghttp2 git commit a1c3f89c72e51

Detected by test 1132

Using the first little merge of nghttp2 into libcurl, I stumbeled on the
missing 'snprintf' in MSVCRT. Isn't this how we do it for other libcurl
files?  I.e. use 'curl_msnprintf' and not 'snprintf' directly:

I build curl.exe (using MingW) with '-DCURLDEBUG' and by importing from
libcurl.dll.  Which means the new curl_easy_perform_ev() must be
exported from libcurl.dll.

This function is meant to work *exactly* as curl_easy_perform() but will
use the event-based libcurl API internally instead of
curl_multi_perform(). To avoid relying on an actual event-based library
and to not use non-portable functions (like epoll or similar), there's a
rather inefficient emulation layer implemented on top of Curl_poll()
instead.

There's currently some convenience logging done in curl_easy_perform_ev
which helps when tracking down problems. They may be suitable to remove
or change once things seem to be fine enough.

curl has a new --test-event option when built with debug enabled that
then uses curl_easy_perform_ev() instead of curl_easy_perform(). If
built without debug, using --test-event will only output a warning
message.

NOTE: curl_easy_perform_ev() is not part if the public API on purpose.
It is only present in debug builds of libcurl and MUST NOT be considered
stable even then. Use it for libcurl-testing purposes only.

runtests.pl now features an -e command line option that makes it use
--test-event for all curl command line tests. The man page is updated.

Moved Curl_easy_addmulti() from easy.c to multi.c, renamed it to
easy_addmulti and made it static.

Removed Curl_easy_initHandleData() and uses of it since it was emptied
in commit cdda92ab67b47d74a.

This reverts renaming and usage of lib/*.h header files done
28-12-2012, reverting 2 commits:

  f871de00... build: make use of 76 lib/*.h renamed files
  ffd8e127... build: rename 76 lib/*.h files

This also reverts removal of redundant include guard (redundant thanks
to changes in above commits) done 2-12-2013, reverting 1 commit:

  c087374c... curl_setup.h: remove redundant include guard

This also reverts renaming and usage of lib/*.c source files done
3-12-2013, reverting 3 commits:

  13606bbf... build: make use of 93 lib/*.c renamed files
  5b6e7927... build: rename 93 lib/*.c files
  7d83dfff... build: commit 13606bbf follow-up 1

Start of related discussion thread:

  http://curl.haxx.se/mail/lib-2013-01/0012.html

Asking for confirmation on pushing this revertion commit:

  http://curl.haxx.se/mail/lib-2013-01/0048.html

Confirmation summary:

  http://curl.haxx.se/mail/lib-2013-01/0079.html

NOTICE: The list of 2 files that have been modified by other
intermixed commits, while renamed, and also by at least one
of the 6 commits this one reverts follows below. These 2 files
will exhibit a hole in history unless git's '--follow' option
is used when viewing logs.

  lib/curl_imap.h
  lib/curl_smtp.h

93 *.c source files renamed to use our standard naming scheme.

This change affects 77 files in libcurl's source tree.

76 private header files renamed to use our standard naming scheme.

This commit only does the file renaming.

----------------------------------------

  renamed:    amigaos.h -> curl_amigaos.h
  renamed:    arpa_telnet.h -> curl_arpa_telnet.h
  renamed:    asyn.h -> curl_asyn.h
  renamed:    axtls.h -> curl_axtls.h
  renamed:    bundles.h -> curl_bundles.h
  renamed:    conncache.h -> curl_conncache.h
  renamed:    connect.h -> curl_connect.h
  renamed:    content_encoding.h -> curl_content_encoding.h
  renamed:    cookie.h -> curl_cookie.h
  renamed:    cyassl.h -> curl_cyassl.h
  renamed:    dict.h -> curl_dict.h
  renamed:    easyif.h -> curl_easyif.h
  renamed:    escape.h -> curl_escape.h
  renamed:    file.h -> curl_file.h
  renamed:    fileinfo.h -> curl_fileinfo.h
  renamed:    formdata.h -> curl_formdata.h
  renamed:    ftp.h -> curl_ftp.h
  renamed:    ftplistparser.h -> curl_ftplistparser.h
  renamed:    getinfo.h -> curl_getinfo.h
  renamed:    gopher.h -> curl_gopher.h
  renamed:    gtls.h -> curl_gtls.h
  renamed:    hash.h -> curl_hash.h
  renamed:    hostcheck.h -> curl_hostcheck.h
  renamed:    hostip.h -> curl_hostip.h
  renamed:    http.h -> curl_http.h
  renamed:    http_chunks.h -> curl_http_chunks.h
  renamed:    http_digest.h -> curl_http_digest.h
  renamed:    http_negotiate.h -> curl_http_negotiate.h
  renamed:    http_proxy.h -> curl_http_proxy.h
  renamed:    if2ip.h -> curl_if2ip.h
  renamed:    imap.h -> curl_imap.h
  renamed:    inet_ntop.h -> curl_inet_ntop.h
  renamed:    inet_pton.h -> curl_inet_pton.h
  renamed:    krb4.h -> curl_krb4.h
  renamed:    llist.h -> curl_llist.h
  renamed:    memdebug.h -> curl_memdebug.h
  renamed:    multiif.h -> curl_multiif.h
  renamed:    netrc.h -> curl_netrc.h
  renamed:    non-ascii.h -> curl_non-ascii.h
  renamed:    nonblock.h -> curl_nonblock.h
  renamed:    nssg.h -> curl_nssg.h
  renamed:    parsedate.h -> curl_parsedate.h
  renamed:    pingpong.h -> curl_pingpong.h
  renamed:    polarssl.h -> curl_polarssl.h
  renamed:    pop3.h -> curl_pop3.h
  renamed:    progress.h -> curl_progress.h
  renamed:    qssl.h -> curl_qssl.h
  renamed:    rawstr.h -> curl_rawstr.h
  renamed:    rtsp.h -> curl_rtsp.h
  renamed:    select.h -> curl_select.h
  renamed:    sendf.h -> curl_sendf.h
  renamed:    setup.h -> curl_setup.h
  renamed:    setup_once.h -> curl_setup_once.h
  renamed:    share.h -> curl_share.h
  renamed:    slist.h -> curl_slist.h
  renamed:    smtp.h -> curl_smtp.h
  renamed:    sockaddr.h -> curl_sockaddr.h
  renamed:    socks.h -> curl_socks.h
  renamed:    speedcheck.h -> curl_speedcheck.h
  renamed:    splay.h -> curl_splay.h
  renamed:    ssh.h -> curl_ssh.h
  renamed:    sslgen.h -> curl_sslgen.h
  renamed:    ssluse.h -> curl_ssluse.h
  renamed:    strdup.h -> curl_strdup.h
  renamed:    strequal.h -> curl_strequal.h
  renamed:    strerror.h -> curl_strerror.h
  renamed:    strtok.h -> curl_strtok.h
  renamed:    strtoofft.h -> curl_strtoofft.h
  renamed:    telnet.h -> curl_telnet.h
  renamed:    tftp.h -> curl_tftp.h
  renamed:    timeval.h -> curl_timeval.h
  renamed:    transfer.h -> curl_transfer.h
  renamed:    url.h -> curl_url.h
  renamed:    urldata.h -> curl_urldata.h
  renamed:    warnless.h -> curl_warnless.h
  renamed:    wildcard.h -> curl_wildcard.h

----------------------------------------

Massively reduce #ifdefs all over (23 #ifdef lines less so far)
Moved conversion-specific code to non-ascii.c