Minor CLI argument change: no more positional arguments


#1

When getting this thing launched I was not using argparse for parsing CLI options. Now I am.

The CLI is now:

opsmop --validate foo.py
opsmop --check foo.py
opsmop --apply foo.py

There are no more positional arguments.


#2

I wanted to get this done prior to starting opsmop-pull and so on, so things would be very consistent.