Add docker clone script

This is a very rough script to "clone" a container. It allows customizing the cloned container to change, edit, or remove options. This probably needs some more cleanup and testing before being merged.

The logic was a bit too complicated to fit in a bash script. Because of the way the argparse module works, the  (-a, -i, -t, privileged) may be parsed differently than docker would. (It doesn't imply a value if they are the last argument before a positoinal argument)