The cavemen quest description includes an 'S' in the lower right
corner of the MAP...ENDMAP section of the locate level. It produced
a secret door as intended but did not have horizontal vs vertical set
because the latter was only being done for DOOR directives. Instead
of adding an explicit directive, make the loading code set horizontal
vs vertical for all doors.
This fixes the orientation of that secret door in the Cav locate
level, but I noticed that it showed up an a visible horizontal wall
when the spots on either side were still blank. It's behaving as
if the door is on a lit spot and the adjacent walls are unlit (this
misbehavior was already present before the current change; it was
just shown incorrectly as a visible vertical wall before).
6faff71a17