001:

Heretic fixes: Doors now always work; secret doors now work

General fixes: Levels are now smaller; validator added to planner.lua
               to make sure a tiny level has exits; it is now possible
               to have deathmatch levels with only one row/column of cells

Not being able to find a staircase now causes Oblige to remake the level
instead of crashing and burning.


002:

Heretic fixes: At smitemaster difficulty, we start the player with the 
               gauntlets and chaos device to give them a fighting chance 
               to get the crossbow.

General fixes: Not being able to find path no longer crashes; all levels that
               lead to secret level now must have both a normal and secret
               exit; levels now must have at least 5 non-scenery cells

Random seeder tweaked to give completely different levels than ObHack 001
            
