Blender Git Loki

First pass at setting up better hotkeys for sculptmode.

http://projects.blender.org/pipermail/bf-committers/2006-November/016311.html
As recommended on bf-committers, I created an entirely separate section for
sculptmode hotkeys, so none of the standard hotkeys in space.c carry over.
(However, the standard hotkeys in toets.c are left unchanged.)

There are probably some useful hotkeys that have been disabled with this commit,
and other hotkeys that still need to be added, so this needs review.