Removed unused logging.config import in _logging.py.
Minor cleanup in test modules. No code change.
Cleaned up config.py. Removed data validation functions. Added tests.

Validation concept wasn't thought through. ConfigParser and
ArgumentParser can do this by themselves.
Created instance of argparse.ArgumentParser in config.py.
Added setup.py and the controller module.

The main() function is declared in backup.controller.
Added command line argument option for verbosity level.