3567: Allow users to annotate review request.

tomas.b*******@gmai***** (Google Code) (Is this you? Claim this profile.)
What version are you running?

There is a UX difference between review comments (done by a reviewer) and annotations (done by the reviewee).

It'd be great if ReviewBoard allowed be to annotate my reviews and not confuse those annotations with review coments. Maybe just use a different color or display them differently somehow.