Updated UOWEventHandler so that it uses session.add() instead of session.save_or_update(). Fixes #1208.
Updated UOWEventHandler so that it uses session.add() instead of session.save_or_update(). Fixes #1208.

git-svn-id: 655ff90ec95d1eeadb1ee4bb9db742a3c015d499@5206 8cd8332f-0806-0410-a4b6-96f4b9520244

obeattie/sqlalchemy,obeattie/sqlalchemy,obeattie/sqlalchemy