Possible memory leak in JTidy

http://jroller.com/page/wakaleo?entry=jtidy_and_memory_leaks

This is obviously a bad thing, since we use JTidy to clean up our HTML before it's run through XSL-FO, which means each PDF export will leak memory.

We should set up a job to run a few dozen/hundred exports, then run YourKit over the problem.