remove_rooms() was trying to be clever and truncate the maximum room bounds
in partially overlapping rooms. In the process, it would truncate the
bounds of L shaped rooms incorrectly, leaving some locations outside the
bounds with the roomno field set. Since the maximum bounds really do not
have to actually match the largest extent of the room in the case of
irregular rooms, it was easiest to just remove the code that was performing
the incorrect truncation. Due to the way remove_room() is coded, this
could result in shopkeeper messages (or, less likely, priest messages,
although that has not been reported yet) occuring for locations to the
right (or the upper/lower right corner) of the MAP on the Bustling Town level.
This solution is mostly a band-aid. Make sure information set by join_map
that is overlaid by the MAP is cleared out. This ensures that place_branch
will never consider invalid data. A new function, remove_rooms(), with a
helper, remove_room(), takes care of this, but only for rooms created by
join_map, which addresses the only known case that causes this problem.
There's a possibility that some other strange behavior, especially in
minetn-6, will be fixed by this as well. The problem of disconnected caves
on minetn-6 is not yet addressed.
Also, add a check to lev_comp.y to make sure the required fg semantics of
joined levels (fg must be ROOM or CORR) are actually met. Doesn't affect
any levels currently included in the distro, but might address levels
others are trying to make.
