Update CEW configuration file
Check DB.update() return value in readModifyWrite

The return value of DB.update() was previously unchecked in
ClosedEconomyWorkload.doTransactionReadModifyWrite(), leading DB.abort() not
being called when a transaction failed half-way
Add full transactional support to JDBC DB client
Merge branch 'bugfix-cew-readmodifywrite' into mi-mo-anomalies-project