* lib/screenshooter-zimage.c, try to fix the last user issue:

	  - set the user as data of the job.
		- give the string and not a pointer to the string to the job.
		- only accept valid utf8 strings as users.
		- update the last user in (cb_image_uploaded).
	* TODO: update the todo list.


(Old svn revision: 7392)