Altered the entirety of the dungeon to be solid and appear as the room
walls for easy transition.  Also changed the path to a brown . instead
of =, for continuity.
Added a randomly appearing "down stair" to the overworld if there is a
dungeon below.  Functionality will be implemented tomorrow.  I would have
gotten further tonight except there was a silly segfault that I spent 1.5
hours trying to fix that went away by rebuilding from a make clean...