libporty 1.0.0
~~~~~~~~~~~~~~
Version bumped to 1.0.0 as this is the first stable release, as libporty
became mature, tested on multiple project.

This release also concentrates on c99tree: the core got converted into a
reusable, reentrant C lib with symbols prefixed by c99c. The code also
keeps more preprocessor tokens and provides better c->tree->c round trips.