add version command

    raise NotImplementedError("Not yet implemented")

def c_version(parser, args):

    '''

    Print installsystems version

    '''

    out(installsystems.version)

# Top level argument parsing

p_main = argparse.ArgumentParser()

p_main.add_argument("-V", "--version", action="version",

p_clean = subparsers.add_parser("clean", help=c_clean.__doc__.lower())

p_clean.set_defaults(func=c_clean)

# version command parser

p_version = subparsers.add_parser("version", help=c_version.__doc__.lower())

p_version.set_defaults(func=c_version)

try:

    # Parse and run

    args = p_main.parse_known_args()[0]