Introduce groups for graphics insets. That includes:

Introduce groups for graphics insets. That includes:
- GuiGraphics dialog field for setup new groups.
- Graphics context menu for assigning to certain group.
- Fileformat change for groupId field in Graphics inset.
- Undo mechanism added to inset-apply, for catching changes
  in preference dialog.
- Qt designer 4.4 used now.

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@24644 a592a061-630c-0410-9148-cb99ea01b6c8