John's edits for IndexBlog

Lots of changes, please feel free to discard any of them.

* Rename `user_groups_bin` to `user_group_bin` because it's a single group
* Shorten some of the headers
* Lots of formatting tweaks
* Standardize on G-Set (vs GSet)
* Standardize on no periods at the end of list items (was inconsistent)
* Drop "CAP control" (because someone, somewhere decided that was a misleading description)