include/vlc_common.h: Define gettext() as a no-op when --disable-nls is used. (Fix compilation with --disable-nls).

    * don't compare svn revisions, we don't support binaries compiled from svn.
    * compare only the 1st character of the "extra" (the 'd' of "0.8.6d")
    * document the status file format
    * don't use %as GNU extension with sscanf()

* updated German translation by Philipp Weissenbacher including a couple of more strings translated by myself and various minor fixes here and there. --- we seriously need to work on the correctness of the English strings.. ;)

Add fonctions to the update system : all is in a thread now. The rc interface doesn't use the update system for the moment and there isn't any encryption for the moment ...

Reference #1374

Qt4 - Mention the VIDEO_TS opening in the tooltip. Opening a VIDEO_TS folder from the *DISK OPENING* works fine. Close #247.

* fixed a crash when quitting VLC while scrolling the credits in the about window. Additionally, improved the help window's memory print slightly