Configuration should default to the 'data' directory, not 'target'

The configuration no longer defaults to a location under WEB-INF, (thanks!) but now it wants to write files to a "target" directory, for example:

Working Directory*: /Applications/continuum-20080912-1809-r694486/target/working-directory

There is already a 'data' directory where the databases live, let's put the build output and working copies there also.

I didn't see where to change this after a quick look around, but AbstractPurgeTest.java will need to be updated (it expects the target directory).