2010-07-04  Andreas J. Guelzow <aguelzow@pyrshep.ca>

	* src/commands.c (cmd_objects_move): simplify
	* src/sheet-control-gui.h (scg_objects_drag_commit): add arguments
	* src/sheet-control-gui.c (scg_objects_drag_commit): add arguments
	  to return GOUndo items and change all callers
	(scg_objects_drag_commit_get_undo_text): new (code from
	  scg_objects_drag_commit)
	(scg_drag_receive_same_process): combine the undos before committing