access control--more to come

I've reviewed the spec for limiting write access (still 2.0.10), and made only a few minor changes:

http://www.compstrm.org/wiki/uuid/TTsWzQipFgyV9bJv92bgwenX

One remaining item is specs for Remarks. You should be able to create a Remark even on a write-protected Topic. And only the author should be able to change the content!