Ahodges/documentation/for662

Added procedures for adding posts, responses, and comments in discussion topics on the Discussion page and in the courseware. Also added contextual information ("Anatomy") for students.
Oddly, the template installed locally for testing the HTML always gets this wrong and restarts from 1 after a break. I agree that it *should* be #, but it causes the test to fail, whereas the live doc is correct either way...