Major Description
- add documentation
- check for duplicate stats;
- check for not exposed statistics
- try to improve the code (reduce the number of access to the CHM)
- add tests to check if they are exported via JMX correctly
- failing test: OptimisticLockingTxClusterExtendedStatisticLogicTest.testWriteSkewOnNonOwner
- failing test: PessimisticLockingTxClusterExtendedStatisticLogicTest.testDeadlockOnNonOwnerWithRemoteTx