Simpler and more forward compatible. The b prefix syntax is available on
all supported Pythons.

The Python project considers the optparse module as deprecated. See:

https://docs.python.org/3/library/optparse.html

> Deprecated since version 3.2: The optparse module is deprecated and
> will not be developed further; development will continue with the
> argparse module.

Replace the project's use with the newer argparse. The CLI is fully
equivalent and should not result in any backwards comparability
concerns.

https://docs.python.org/3/library/argparse.html