STACKING_DEBUGGING and dumpState() improvements
STACKING_DEBUGGING and dumpState() improvements

 * src/mcompositemanager.cpp
   -- dumpWindows() added
   -- roughSort(): use it to dump stacking_list before and after sorting
   -- dumpState(): make the command line space-delimited, rather than \0-delimited

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