Disabled memo for now, added new biomes, etc.

Made minor tweak to point placing code which should save a very small
amount of memory and time.
Fixed typo in regionFilename().

Needs to check both X and Z, not just Z.
Made tests use tempdir.
Removed unnecessary setting of setSaveDir()
Added swamp biomes.
Updated documentation.
Removed deadwood.

This code was no longer being used.
Cleaned up old code, added flag for spawn tests, etc.

Some columns aren't valid as potential spawn points, so there's now a
check for that.  More old unused code got removed as well.
Updated documentation.

Just about done with initial pass for world generation.