Not done for stdin

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

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

To handle case where none of the file given as argument is readable

Testing ttail_search_closest_files() on multiple files

Set some function inlune and implement an utility function
for file searching functions.

Now we can specify a constant length to cut

The getline wrapper will allow to use getline without calling malloc
and free all the time