check_env: comment out apparent deadwood _ROOT setting, docstring, pep8
setup: use parameter for target folder (a big change)

Initial working process to create the an empty skeleton folder tree,
install.db and setup config files. The calling is a little messy,
because it has to be initialized before the command line is parsed (and
thus we don't know all the standard config values yet).

It works, but needs tightening up.
non working attempt to improve setup parameter handling

this is gross. It just doesn't work and I can tell fixing it is just the
wrong path. Going to have to wait until we use click or argparse or
whatever the heck.
disabled pending argparse/whatever implementation
fix mirror, closes #5