=per #3739 Fix broken Javadoc generation

- caused by field named 'native' in LevelDBJournal
Merge pull request #1845 from krasserm/wip-3739-javadoc-gen-broken-krasserm

=per #3739 Fix broken Javadoc generation
!per #3729 Journaling protocol optimization

- internal batching of individually received Persistent messages
- testing fault tolerance of Processor in presence of random
  * journaling failures
  * processing failures