Qt4 - Switch the HelpDialog to a QVLCFrame, save size/pos for it. Saze size/pos for updateDialog ( noone care about size...). Switch about to a QVLCDialog to ensure better view. Ensure to destroy the QVLCFrame on quit.
Should close #1374.

Qt4 - add a file to document a few things, especially the difference between QVLCDialog and QVLCFrame.

Qt4 - Fix mediaInfoPanel in most (all?) of the situations and during resizing. Less funny but more solid, clean and aligned.

Qt4 - Remove the qt-pl-showflags from preferences and put it in QSettings,because there is no way a normal being get it right.

Don't test that vlc --help and vlc --version works because automake thinks that any output on stderr is an error.

Remove code duplication

Define DATA_PATH in the root CMakeList.txt since modules might need it (for example the http intf or the lua module)

reported by Felipe Manzano and Anibal Sacoo from Core Security Technologies.