Replication: enhanced performance, by restricting the receivers of...

Replication: enhanced performance, by restricting the receivers of hearbeat-messages to replication master and suspending the time-drift-detector on servers that are currently not replication master; fixed a bug caused by wrong lastOnView LSN updates

git-svn-id: https://babudb.googlecode.com/svn/trunk@268 d4c7dd96-b7b2-11dd-893d-d98698f66bbf