added ps etimes, miscellaneous top enhancements

ps program
 . etimes added for ELAPSED expressed in seconds
 . time_t used in place of former unsigned long

top program
 . corrected scroll message bug when 'x' toggle on
 . fixed forest view potential missing libflags bug
 . improved 'k' default signal invocation logic
 . enhanced logic for %CPU maximums displayed
 . made signal handling more robust and efficient

ps/parser.c

@@ -617,6 +617,10 @@ static const char *parse_bsd_option(void){
       trace("c true command name\n");
       bsd_c_option = 1;
       break;
+//  case 'd':
+//    trace("d FreeBSD-style tree\n");
+//    forest_type = 'f';
+//    break;
     case 'e':
       trace("e environment\n");
       bsd_e_option = 1;