Add RemoveGITPaths, make RemoveSVNPaths just do SVN

I decided it was going to be bad in the long run to have RemoveSVNPaths also remove .git paths.  Just too confusing in terms of the mismatch between function name and what the function does.  I put RemoveSVNPaths back the way it was, and added a new function RemoveGITPaths.

Signed-off-by: David Brainard <brainard@psych.upenn.edu>