Deleted ps_test, since it isn't updated by the autobuilder and will be
out of date.
Removed console history file, since it doesn't need to be
version-controlled.
This was SVN commit r2823.
- Hotkeys Q, A, Z to toggle, raise and lower the water plane
respectively.
- A unit trait, named anchor, that says whether it attaches to the
terrain or the water.
- Small changes to rendering code.
This was SVN commit r2744.