[jvstm-lf] Don't signal EarlyAbort

  * It breaks RadarGun :-(
[jvstm-lf] Experiment with new lock-free commit algorithm
[jvstm-lf] Commit requests of Write-only transactions must always be valid
yet another bunch of fixes: validation!
[jvstm-lf] Several fixes. Revise validation algorithm. Reuse commit Ids when resending.
[jvstm-lf] Several fixes. Include increasing sleep based on commit contention.
Do not put in the Datagrid the mapTxVersionToCommitId above a certain version