* gdesktop.c (desktop_create_launch_entry): Support for the "Drop"
target in mc.ext now.
* Add support for dragging the icons on the desktop.
(desktop_icon_make_draggable): new function.
(drop_from_event): simplify.
(my_create_transparent_text_window): Get the motion notify event.
(drops_from_event): create a vector based on thge drop event.
(drop_cb): splitted, call url_drop for regular drops, otherwise it
is a icon drop.
(artificial_drag_start): new routine, used now by gscreen.c and
gdesktop.c
(drop_on_directory): Check result value of operation.
(desktop_icon_set_position): sane interface.
(stop_desktop): Flush all of our state to disk.
