Replication in BufferedLogger now also logs the last committed TID, some minor fixes
adds failover mode to BufferedLogger::replicate
Merge branch 'readOnlyReplication' of github.com:hyrise/hyrise into readOnlyReplication
Exchange masternode start flag with nodeId.
Master should have nodeId = 0. nodeIds have to continously increase by 1.
Remove nodeId from settings. Store it in PGMInterface
Let nodes send their id. Let every node maintain a list with node information
Remove old, now wrong comment
Introduce ClusterManager and detect if failover necessary
Realise failover, wire up with BufferedLogger changes