Ignore emacs file detritus and more of the package code we pull down.
Try to make this executable.
Fix help check logic. Try to exit if we fail to pushd. Hedge more
about what we're actually building.
Ignore detritus more effectively.
Put PDFs in the right place, link ROOT to the version of Pythia we build.
Add a script to scrub the area.
Try to use "nice" correctly.