debugging enhancements for stacking
debugging enhancements for stacking

 * src/mcompositemanager.cpp:
   -- MCompositeManagerPrivate::checkStacking():
      log the actual XRestackWindows() arguments
   -- MCompositeManager::dumpState():
      dump the transients of windows

siraj/mcompositor,nemomobile-graveyard/mcompositor,siraj/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor,siraj/mcompositor,siraj/mcompositor,nemomobile-graveyard/mcompositor,nemomobile-graveyard/mcompositor