Also:
- Reanamed foo and bar subcommand methods to base_foo and base_bar

I eliminated a few "narg=1" configurations so that a single str value is returned instead of a List[str].

I also reworded some documentation which was no longer correct after the last commit which made "history command" have the same help text as "command -h" when using one of the two argparse decorators.

Now "help command_name" and "command_name -h" provide exactly the same text.

The function docstring for the "do_*" command sets and overrides the ArgumentParser "description" if the docstring is not empty.

Also added another @with_argparser_and_list decorator that uses argparse.parse_known_args to pass two arguments to a command:  both the argparse output and a list of unknown/unmatched args.

1) cmd2 no longer imports make_option from optparse
- test files and examples now import this directly
- this helps emphasize that this old optparse methodology of adding options to commands is deprecated

2) All argparsers have been given custom names instead of just "argparser"
- this helps with readability and maintainability, especially with IDE renaming and such