ISPN-3932 FineGrainedAtomicMap with REPEATABLE_READ sees modifications f...

...rom other transactions

* Rebased atomic tests to cover both FineGrainedAtomicMap and AtomicMap
* Fixed bug in values() that was removing the duplicate values
* Added new DeltaAware interface that allows to copy the instance

https://issues.jboss.org/browse/ISPN-3932