OPENJPA-2343: Version field returns null when explicity projected from a JOIN in SELECT clause - based fix off of patch provided by Howard Kelsey.  Merged 2.1.x commit to 2.2.1.x.

git-svn-id: https://svn.apache.org/repos/asf/openjpa/branches/2.2.1.x@1533222 13f79535-47bb-0310-9956-ffa450edef68