Exits are created with @OPEN
Exits are given destinations with @LINK.
Exits have the following attributes:
Name, Description, Succ, Fail, Osucc, Ofail, use-lock, see-lock,
Cost (in crowns), groups to toggle, and destination.
The following flags are meaningful on exits:
Bot, Dark, Hush, Quell, Sticky, Tattle, Unwanted
(Direction) shows up on the room's [Commands:] or [Exits:] line,
depending on its destination, @LOCKs and DARK flag.
Exits can be linked to Rooms, or the keywords HERE, BACK, HOME or RETURN.
Sticky exits are actually groups; the group-members are players who've