Cleanups to RPC code.

This is extracted from a significantly longer RPC change that I put down a couple of weeks ago.

It deletes some unused code, uses Issue and Book a little more, and fixes some long lines and indentation.

Feel free to use this or ignore it!
Hmm, I don't understand why this is showing such a diff.  I'm going to revert it and then redo it, because this was only a fast change...