rcfile parsing and cl parsing

The rcfile parsing now allows for the use of a comment character
(currently "#"). It also is a little more helpful by checking
for multiple values given for something that expects just one
and also checking for no values given.

The mimicing is going forward. I added a command line argument
for it with nargs="*" so that you can go
--mimic "elastic:pyplastic" "vonmises:pyplastic" ...

However, command line arguments for 'mml run' always (before I made
any changes, even) give me the following error:

$ mml run --sqa elastic-unistrain-stressc.py
/home/mswan/local/git/mml/bin/mml-run: illegal option -- -
/home/mswan/local/git/mml/bin/mml-run: illegal option -- s
/home/mswan/local/git/mml/bin/mml-run: illegal option -- q
/home/mswan/local/git/mml/bin/mml-run: illegal option -- a
Unknown option: --
usage: /usr/bin/python [option] ... [-c cmd | -m mod | file | -] [arg] ...
Try `python -h' for more information.

Still looking into it.