Changing version number updating changelogs

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...

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

Attempt to make the doxygen version filter works with git

For extended & case insensitive regex