- remove preferences CLI option , the application can set the
      default save folder now.
    - fix the rc file mess. Use xfce_resource_lookup and 
      xfce_resource_save_location so that folders get created if they
      don't exist. Thanks to Nick Schermer for helping.
  * lib/screenshooter-utils.{c,h}:
    - remove the dir_only option in (screenshooter_read_rc_file).
  * lib/screenshooter-dialogs.{c,h}:
    - remove (screenshooter_preferences_dialog).
  *lib/screenshooter-actions.c:
    - don't hardcode "/tmp", use g_get_tmp_dir () instead.
  * panel-plugin/screenshooter-plugin.c:
    - use new syntax for screenshooter_read_rc_file.


(Old svn revision: 6235)