formula: fix whitespace.
ENV: add method to prepend and create a PATH.
Pathname: add methods to write env scripts.
caveats: show python caveats if modules installed.
ansible: cleanup python usage.
aubio: cleanup python usage.
beecrypt: cleanup python usage.
binwalk: cleanup python usage.
bulk_extractor: cleanup python usage.
bup: cleanup python usage.
cantera: cleanup python usage.
charm-tools: cleanup python usage.
cmu-sphinxbase: cleanup python usage.
collectd: cleanup python usage.
cookiecutter: cleanup python usage.
cvs2svn: cleanup python usage.
diffuse: cleanup python usage.
disco: cleanup python usage.
discodex: cleanup python usage.
distcc: cleanup python usage.