2005-12-06 Richard D. Worth <richard@theworths.org>

        * PROTOCOL: Add error NO_INVITE

        * TODO: Uncheck INVITE, ACCEPT

        * src/ttt-error.c: (ttt_error_string): Add errors NO_INVITE,
        NO_GAME

        * src/ttt-client.c: (_ttt_client_execute_message),
        (_ttt_client_execute_help), (_ttt_client_execute_version),
        (_ttt_client_execute_invite), (_ttt_client_execute_accept),
        (_ttt_client_execute_retract), (_ttt_client_execute_decline):
        Whitespace changes. Partially implement RETRACT, DECLINE.