Use FastRotorSearch for a quick-and-dirty general conformer.

Should be significantly faster than the WeightedRotorSearch.
Full evaluation will be performed in the next few months by
an interested undergrad student.
Add FastRotorSearch to available methods. Fix FF-based methods.

FF-based methods wouldn't actually perform any work. Now actually
do the conformer searching with these methods (and a quick clean-up).
Add some automatically-built scripts/ code to prevent commiting to git