Revert changes relative to lib/*.[ch] recent renaming

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

f871de0... build: make use

Revert changes relative to lib/*.[ch] recent renaming

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

f871de0... build: make use of 76 lib/*.h renamed files
ffd8e12... 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:

c087374... 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:

13606bb... build: make use of 93 lib/*.c renamed files
5b6e792... build: rename 93 lib/*.c files
7d83dff... build: commit 13606bbfde 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

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build: make use of 93 lib/*.c renamed files

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

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

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

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

This change affects 322 files in libcurl's source tree.

test suite: libtest header inclusion cleanup

Added missing memoryTracking to test cases 560 and 583. If this triggers
leak detection on these, it only means that previously it was going

test suite: libtest header inclusion cleanup

Added missing memoryTracking to test cases 560 and 583. If this triggers
leak detection on these, it only means that previously it was going unnoticed.

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sources: update source headers

All C and H files now (should) feature the proper project curl source
code header, which includes basic info, a copyright statement and some
basic disc

sources: update source headers

All C and H files now (should) feature the proper project curl source
code header, which includes basic info, a copyright statement and some
basic disclaimers.

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remove the CVSish $Id$ lines

removed trailing whitespace

Addes OOM handling for curl_easy_setopt() calls in test

include "memdebug.h"

Made sure to pass longs in to curl_easy_setopt where necessary in the
libtest code.

Don't abort tests 518 and 537 when unable to raise the open-file soft limit

Fix missing right parenthesis

Fix comparison between signed and unsigned

unify fopen() failure error message among tests, allowing
the testsuite to count them as errors of the same kind

add debug message and expand comment

test can be allowed to run if fopen() is capable of fopen()ing
three additional files once that we have already open()ed the
big bunch of file descriptors.

cleanup

test can be allowed to run if fopen() is capable of fopen()ing
SAFETY_MARGIN additional files once that we have already open()ed
the big bunch of file descriptors.

Verify if the test is limited by an ancient stdio with a 256
open file limit. In this case the test is skipped with a
message showing this limitation when the number of open files
needed

Verify if the test is limited by an ancient stdio with a 256
open file limit. In this case the test is skipped with a
message showing this limitation when the number of open files
needed for the test is greater than 256.

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use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

when using select() instead of poll, skip the test if the number of
open file descriptors is greater than FD_SETSIZE minus SAFETY_MARGIN,
also skip the test if any of the open file descriptor

when using select() instead of poll, skip the test if the number of
open file descriptors is greater than FD_SETSIZE minus SAFETY_MARGIN,
also skip the test if any of the open file descriptors has a number
greater than FD_SETSIZE minus SAFETY_MARGIN.

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fix temp string buffer variable name

skip test on platforms on which we use select() instead
of poll() and select() happens to be bound by FD_SETSIZE

Compiler warning fix

add a couple more of debugging messages