Removed user and passwd from the POP3 struct as these cannot be set on
a per-request basis and are leftover from legacy FTP code.

Changed some comments still using FTP terminology.

Moved the mailbox and custom request variables from the per-connection
struct pop3_conn to the new per-request struct and fixed references
accordingly.

Created a new POP3 structure and changed the type of the pop3 proto
variable in connectdata from FTP* to POP*.

Used imap_atom() to escape mailbox names in imap_select().

Moved the ftp transfer structure into pingpong.h so other protocols that
require it don't have to include ftp.h.

Corrected comment for opt_no_body variable to CURLOPT_NOBODY.

Changed some variables and comments still using FTP terminology.

Removed user and passwd from the IMAP struct as these cannot be set on
a per-request basis and are leftover from legacy FTP code.

Created a new IMAP structure and changed the type of the imap proto
variable in connectdata from FTP* to the new IMAP*.

Moved the mailbox variable from the per-connection struct imap_conn to
the new per-request struct and fixed references accordingly.

Following commit 65644b83 for the IMAP module updated the clean-up
comment in POP3.

Moved the clean-up of the mailbox variable from imap_disconnect() to
imap_done() as this variable is allocated in the do phase, yet would
have only been freed only once if multiple selects where preformed
on a single connection.

Fixes a typo get → git in docs/CONTRIBUTE.

Ignores the patch files generated by the 'git format-patch' command.

* Elaborates on default values of some curl_easy_setopt() options.
* Reminds the user to cast variadic arguments to curl_easy_setopt() to
  'void *' where curl internally interprets them as such.
* Clarifies the working of the CURLOPT_SEEKFUNCTION option for
  curl_easy_setopt().
* Fixes typo 'forth' → 'fourth'.
* Elaborates on CURL_SOCKET_TIMEOUT.
* Adds some missing periods.
* Notes that the return value of curl_version() must not be passed to
  free().

Always interprets the pointer passed with the CURLOPT_WRITEDATA or
CURLOPT_READDATA options of curl_easy_setopt() as a void pointer in
order to avoid problems in environments where FILE and void pointers
have non-trivial conversion.

* Adds several links to documentation of library functions which were
  missing.
* Marks documentation of deprecated library functions "(deprecated)".
* Removes spurious .html suffixes.

Use Curl_pp_moredata() in Curl_pp_multi_statemach() to check if there is
more data to be received, rather than the socket state, as a task could
hang waiting for more data from the socket itself.

Fixed an incorrect variable reference which was introduced in commit
a1701eea as a result of a copy and paste from SMTP/POP3.

A simple function to test whether the PP is not sending and there are
still more data in its receiver cache. This will be later utilized to:

1) Change Curl_pp_multi_statemach() and Curl_pp_easy_statemach() to
   not test socket state and just call user's statemach_act() function
   when there are more data to process, because otherwise the task would
   just hang, waiting for more data from the socket.

2) Allow PP users to read multiple responses by looping as long as there
   are more data available and current phase is not finished.
   (Currently needed for correct processing of IMAP SELECT responses.)

I just noticed Metalink support wasn't listed as a feature of the tool.

The this_url pointer wasn't being initialized, so if strdup() would return
null when copying the filename in a metalink file, then hilarity would
ensue during the cleanup phase. This change was brought to you by clang,
which noticed this and raised a warning.

Schannel and darwinssl use the certificates built into the
OS to do vert verification instead of bundles. darwinssl
is thread-safe. Corrected typos in the NSS docs.

The attempt to use gai_strerror() or alternative function didn't work as
the 'sock_error' field didn't contain the proper error code. But since
this hasn't been reported and thus isn't really a big deal I decided to
just scrap the whole attempt to output the detailed resolver error and
instead remain with just stating that the resolving of the name failed.

conversion to 'int' from 'long int' may alter its value

follow-up to commit ed7174c6, rename 'wait' to 'block'

It seems older gcc installations (at least) will cause warnings if we
name a variable 'wait'. Now changed to 'block' instead.

Reported by: Jiří Hruška
Bug: http://curl.haxx.se/mail/lib-2013-02/0247.html

Apple made a number of changes to Xcode 4. The SDKs were moved, the entire
Developer folder was moved, and PowerPC support was removed. The script
will now adapt to those changes and should be future-proofed against
additional changes in case Apple moves the Developer folder ever again.
Also, the minimum OS X version compiler option was removed, so that the
framework can be built against the latest SDK but still run in older cats.

Tidied up result variables to be consistent in name, declaration order
and default values.

Fixed a 64-to-32 compiler warning raised when building with
clang and the --with-darwinssl option.

Pointed out by Steve Holme

Due to the reordering of functions in commit 586f5d36 the forward
declaration to state_upgrade_tls() are no longer required.

Repaired all curl/lib/checksrc.pl warnings in the previous four patches