ManifoldCF running with Derby 10.8.1.1 has problems pausing and aborting jobs

Since upgrading to Derby 10.8.x.x, tt takes minutes to crawl just 20 documents. Clearly the Derby contention/locking bugs are back with a vengeance in 10.8.x.x. Either we use 10.7.x.x or we get the Derby team to look at them again.

In the interim, maybe it is time to use hsqldb as the default embedded database for the single-process example instead of Derby.