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.

contrib: Setting DYLD_LIBRARY_PATH is bad because it results most of the time in library mismatch. This is an old hack from the past which shouldn't be needed anymore.