[DPP-53] rename Process to GenProcess

[qnikst]

[Imported from JIRA. Reported by Eric Merrit @ericbmerritt) as DPP-53 on 2013-01-11 20:56:58]
along with some cleanup commits.

Note that I only renamed Process, not ProcessAction, RPC or any of the others. I think those are fine as is, but that depends on your logic.