Hopefully we now handle all of the wrap around cases (either by refusing them,
or doing the logical thing).
Bump up the max message size a tad; I've run into the 64KiB one on a few
occasions.
A few tests for libpplmenet, plus a couple of fixes of improper error handling.
Added some logging of timing, which is a Good Thing, because otherwise I may
not have noticed that the Worklette scheduling was slightly broken.  &:O
Some minor changes as the result of Elliott's proof.  <3
Beefin' up the documentation.  &:)
Final tweak.  We now optimize on age lookup too.  WOO.
HOO.