Responding to code review <https://info.ravenbrook.com/mail/2014/03/07/18-03-14/0/>.
Updating Splay Tree design document to be reasonably consistent with the current code.
Disabling tree functions not currently in use.
Responding to code review <https://info.ravenbrook.com/mail/2014/03/07/22-40-36/0/>.
Using TREE_ELT where appropriate.
Using AVERT consistently on Tree, but see job003691.
Improving comments in response to code review suggestions <https://info.ravenbrook.com/mail/2014/03/11/14-47-33/0/>.