Added support for icon emiting from appdir's as well

Added support for icon emiting from appdir's as well
Added icon dump support better to discotest, and to pndnotifyd
icons are dumped out into dotdesktop dir with unique-id, same as .desktop file
in discotest and pndnotifyd case, the disco struct is edited to refer to the new icon location (on success of course)
As such .desktop now shows new icon, woowoo
NOTE: The icon file is not removed when the .desktop is .. leave icon behind for cache sake?