2006-10-25  Lukasz Zalewski  <lukas@dcs.qmul.ac.uk>

        Fixes enhancement request #358114.
        * daemon/gdmconfig.c: Added variables & functions used to read/store
          CustomCommands related values
        * daemon/gdm.c (custom_cmd): New function that handles
          execution of CustomCommands.
        * daemon/gdm.c (custom_cmd_restart): New function that handles
          execution of CustomCommand if NoRestart option is set to false
        * daemon/gdm.c (custom_cmd_no_restart): New function that handles
          execution of CustomCommand if NoRestart option is set to true
        * daemon/gdm. [ch]: Updated macros and several functions to accomodate
          new CustomCommands functionality
        * daemon/slave.c: Added Custom command interrupt handler to handle
          the CustomCommands execution.
        * gui/gdmlogin.c (gdm_custom_cmd_handler): New function that handles
          execution of CustomCommands
        * gui/gdmlogin.c: Added variables and updated several functions to
          accomodate new CustomCommand functionality
        * gui/greeter/greeter_configuration.h: Added variables used to
          store CustomCommand related values
        * gui/greeter/greeter.c: Added variables that use/store
          CustomCommand related values
        * gui/greeter/greeter_item.c: Added visibility check for custom_cmd
          related widgets
        * gui/greeter/greeter_parser.c: Added code for parsing custom_cmd stock
          items
        * gui/greeter/greeter_system.c (greeter_custom_cmd_handler): New
          function that handles execution of CustomCommand
        * gui/greeter/greeter_system.c (query_greeter_custom_cmd_handler): New
          function that handles execution of CustomCommand (with warn message
          query beforehand)
        * gui/greeter/greeter_system.c: Updated macros and several functions
          to accomodate new CustomCommand functionality