New command show updates:

(show): New sub-command.
(player_coms): Update its c_form.
(show_updates, fmttime2822): New.

(vers): Show game_days and game_hours.

(upda): Mark obsolete and point to show updates.
(vers): Point to show rather than update.

Rewrite much of info zdone.

src/lib/commands/upda.c

@@ -95,5 +95,7 @@ upda(void)
     if (*game_hours != 0)
 	pr("Game hours are: %s\n", game_hours);
 
+    pr("\nThis command is obsolete and will go away in a future version.\n"
+       "Please use \"show updates\".");
     return 0;
 }