Lists of Links now work
Incorporated the Actuarius code directly in

This was going to be needed soon anyway, since I plan to rapidly evolve
away from traditional Markdown syntax.  And I've been having lots of
problems staying synchronized with the Maven repository, so it's easier
to just pull the code in now.
Cleanup
Now running on MySQL

Not fully tested yet, but the basics work
Fixed a crash bug

When loading a Space that had a Thing with an empty list of Links, it
would crash.  This was because the List deserializer didn't correctly
detect an empty input.