Get rid of outdated python, csh options

[steveri]

Expunge outdated python and csh alternatives from the repo.
Maybe start here:

egrep 'python|csh' `git ls-files`
git ls-files | egrep 'csh|py'

[steveri]

And/or, at the very least, maybe perl should be the default choice e.g.
'bin/golden_test.sh -sim ver
should default to
bin/golden_test.sh -sim ver --perl

[steveri]

Why keep perl and not python version?

• note cannot run fftgen w/o perl b/c genesis2(!) :(
• so if we have to choose one it would have to be perl right? :(

OR: maybe just replace Genesis2 with a python script omg