Commit to pull.
Merge branch 'master' of https://github.com/schiem/roguelike
Merge branch 'master' of https://github.com/schiem/roguelike
Merge branch 'master' of https://github.com/schiem/roguelike

Conflicts:
	src/world/terrain_defs.cpp
Removed the top layer because it was gross.  Instead, the enemies in the
visible region are passed to the gui_render, where they are rendered.
Huzzah.