src/tool: allow timeouts to accept decimal values

Implement wrappers around strtod to convert the user argument to a
double with sane error checking. Use this to allow --max-time and

src/tool: allow timeouts to accept decimal values

Implement wrappers around strtod to convert the user argument to a
double with sane error checking. Use this to allow --max-time and
--connect-timeout to accept decimal values instead of strictly integers.

The manpage is updated to make mention of this feature and,
additionally, forewarn that the actual timeout of the operation can
vary in its precision (particularly as the value increases in its
decimal precision).

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src/tool_paramhlp: try harder to catch negatives

strto* functions happily chomp off leading whitespace, so simply
checking for str[0] can lead to false negatives. Do the full parse and

src/tool_paramhlp: try harder to catch negatives

strto* functions happily chomp off leading whitespace, so simply
checking for str[0] can lead to false negatives. Do the full parse and
check the out value instead.

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tool_paramhlp: Fixed options being included in username

Fix to prevent the options from being displayed when curl requests the
user's password if the following command line is specified:

tool_paramhlp: Fixed options being included in username

Fix to prevent the options from being displayed when curl requests the
user's password if the following command line is specified:

--user username;options

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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 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.

avoid mixing of enumerated type with another type

cmdline: parse numerical options stricter

1 - str2offset() no longer accepts negative numbers since offsets are by
nature positive.

2 - introduced str2unum() for the command lin

cmdline: parse numerical options stricter

1 - str2offset() no longer accepts negative numbers since offsets are by
nature positive.

2 - introduced str2unum() for the command line parser that accepts
numericals which are not supposed to be negative, so that it will
properly complain on apparent bad uses and mistakes.

Bug: http://curl.haxx.se/mail/archive-2012-07/0013.html

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curl tool: make curl.h first header included in tool_setup.h

curl tool: use configuration files from lib directory

Configuration files such as curl_config.h and all config-*.h no longer exist
nor are generated/copied into 'src' directory, now thes

curl tool: use configuration files from lib directory

Configuration files such as curl_config.h and all config-*.h no longer exist
nor are generated/copied into 'src' directory, now these only exist in 'lib'
directory from where curl tool sources uses them.

Additionally old src/setup.h has been refactored into src/tool_setup.h which
now pulls lib/setup.h

The possibility of a makefile needing an include path adjustment exists.

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curl tool: allow negative numbers as option values

Fix the str2num() function to not check if the input string starts with a
digit, since strtol() supports numbers prepended with '-' (an

curl tool: allow negative numbers as option values

Fix the str2num() function to not check if the input string starts with a
digit, since strtol() supports numbers prepended with '-' (and '+') too.
This makes the --max-redirs option work as documented.

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curl tool: reviewed code moved to tool_*.[ch] files

curl tool: OOM handling fixes

curl tool: code moved to tool_*.[ch] files