Taken from r1770 of Duke's WCSim repo

http://svn.phy.duke.edu/repos/neutrino/dusel/WCSim/trunk/CMakeLists.txt
Fixes for this WbLS version.

This may not yet be working.
Add worch build for prereqs.

Note, it seems the G4.9.6p3 currently being built may be too new.
Uncomment offending SetModel()
Small update.