Upgrade X-Stream to 1.4.4 to avoid nasty errors on JDK7+
Revert "Implement Serializable to avoid a (sporadic?) XStream exception on selecting rows in some environments."

This reverts commit 5b69b54bd554b05289833bc7957ceea5b865dd46.
The problem should have been resolved by the previous X-Stream update.
IDEA project definition update.