Jan 29: added backlinks. Doesn't work perfectly because it uses mysql's indexed keyword searching which tries to optimize out what it thinks are bad results.

Jan 29: changed the ordering of the revision links so that they go most recent to oldest. This seems to make more sense.
There's an unfortunate weirdness with the backlinks: it searchs all the definitions, not just the most recent. The information revealed is true, just not well lept to. I'm not sure whether to have the backlink go to the definition that links, or (as it is now) have it go to the most recent definition.