And bugfixes in _ttail_set_date_relative() bad format detection

Changing version number updating changelogs

In order to not install them.

Now ttail is able to sort logfiles given as arguement.
The sort function _ttail_file_sort place files with no valid date to the
end of the file list and is able to detect if some files overlaps.

No tests written...

But not by alphabetical order :P

Not 100% sur of implementation. And the feature seems a bit useless..

Adds the option -P --permissive.

Starts implementation for logfiles.

Now -P flag make ttail handle invalid files. When invalid file given the
minmax function set the file pointer and the minmax array to NULL.

May introduce bugs if the binary search function does not handles "holes"
in fp array or in minmax array...

Telling getopt to produce an error message by setting opterr to 1

using --disable-check configure option

The manpage update was broken. Now make docs updates the manpage.

Date detection on stdin enabled

Not done for stdin

Attempt to make the doxygen version filter works with git

Making this function usable by logfiles and stdin format autodetection

Four macros were added :
 - TTAIL_CHECK_START(char *test_suite_str, char *test_case_str)
 - TTAIL_SET_FIXTURE(void (*setup)(), void (*teardown)())
 - TTAIL_ADD_TEST( libcheck_test test)
 - TTAIL_CHECK_END

Now the doc in generated before the code compils

tests/Makfile.am is now generated using tests/regen.sh .
bootstrap.sh has been updated.
Argument parsing tests are splitted

Seems to work with stdin

Now make has a docs target to enforce docs generation

Date formats

        Two date formats are allowed for dates arguments (-d , -m) :
        - the same than in the logfile
        - relative from now prefixing the argument with '#-' and given a unit
                - y : year
                - M : Month
                - d : day
                - h : hour
                - m : min
                - s : sec