Cleanup branches to make the project more maintainable.

There are a few legacy branches kicking around that make it tough for developers to checkout and start work on the most recent source. They should be all cleaned up so that master is the only long running branch.

Start by inspecting the repository's branch list and identifying which branches are legacy versus the current master branch. Confirm that master is the only long-running branch and that obsolete branches can be removed; done means developers can find the current source without those branches present.

Written by the indexing model from the issue text.