Improve CLI

[benjamc]

. A suggestion to improve this would be to have this command available through something like python -m carps generate-cluster-configs ... first, so that all commands that someone might need to run is through python -m carps <*arguments> with an assocaiated --help. The second recommendation is to end the result of running create_cluster_configs.py with some message about what was just done (a database of all experiments to be run was created at /path/carp.db) as well as a recommendation and what should be run next.

(Eddie)

• Add nice entry points
• Add insightful help messages
• Log what is going to be done and what is done and where to find results etc