2006-01-04  Brian Cameron  <brian.cameron@sun.com>

        * configure.ac, docs/C/gdm.xml, config/gdm.conf.in: Fix
          Prefetch command so that there is a needed "@" before the
          argument to gdmprefetch.  Padraid O'Briain pointed out this
          oversight.  Made docs a bit more clear to highlight the usage
          of this "@" character.
        * gui/greeter.c, gui/greeter/greeter_item.c,
          gui/greeter/greeter_system.c: Now call gdm_working_command_exists
          for halt/reboot/suspend/configurator once at startup and cache
          the values in globals so we don't have to keep calling this
          function over and over while gdmgreeter runs.  Padraig noticed
          that this function causes a large number of calls to stat which
          are easily avoided by caching.