SAFERHANGUP

This is an initial round of SAFERHANGUP hangup changes.  It introduces
SAFERHANGUP, provides the core framework, and enables it for UNIX.

Window-port changes are provided for win/tty, win/X11 and win/gnome.  Qt
changes should be forthcoming after having Warwick look at them.
window.doc is updated so windowport maintainers have an clue what needs to
be done to support SAFERHANGUP.

win/X11/winmap.c

@@ -1622,6 +1622,10 @@ x_event(exit_condition)
 		    inptr = (inptr+1) % INBUF_SIZE;
 		    /* pkey(retval); */
 		    keep_going = FALSE;
+		} else if (program_state.done_hup) {
+		    retval = '\033';
+		    inptr = (inptr+1) % INBUF_SIZE;
+		    keep_going = FALSE;
 		}
 		break;
 	    case EXIT_ON_KEY_OR_BUTTON_PRESS:
@@ -1637,6 +1641,10 @@ x_event(exit_condition)
 			/* pkey(retval); */
 		    }
 		    keep_going = FALSE;
+		} else if (program_state.done_hup) {
+		    retval = '\033';
+		    inptr = (inptr+1) % INBUF_SIZE;
+		    keep_going = FALSE;
 		}
 		break;
 	    default: