Suggested changes to PurpleCipherOps and need for code review

[Ethan Blanton]

Tomasz Wasilczyk spake unto us the following wisdom:
> In my opinion, current PurpleCipherOps structure is incomplete and
> could be improved. I think, most of these is related to 2.x.y backward
> compatibility, so we could tidy things up for 3.0.0.

I don't think this is a security issue, I think we should take it to
devel at .

Ethan