probably gettext is missing on os x
Let ./configure find Macport libs and includes
Merge remote-tracking branch 'upstream/next' into next
No need to deliver a own config.rpath
[Codying Style] Fix indentation
Merge pull request #116 from alexander-zimmermann/next

Tweak autotools for OS X support
Merge pull request #115 from erzb5e6f65/next

Introduce a user tag in argparser option struct
Merge branch 'next' of https://github.com/flowgrind/flowgrind into comment_parser
Added ap_free call to end of programs and made arg parser static in controller+daemon.

This makes sure the arg parser lives as long as the program.
[Code Style] Added comments to parsing functions + Adapted function headers
Added function ap_is_used() to check if an option was given on the cmdline.
Added macro "ERRX_AND_EXIT" for parsing errors. Cleaned up and unified option parsing functions.