BabuDB/Java/Replication:

cleaned up dependencies of HeartbeatThread within the replication logics;
participants are initially set available instead of dead at the ParticipantsStatesTable;

git-svn-id: https://babudb.googlecode.com/svn/trunk@546 d4c7dd96-b7b2-11dd-893d-d98698f66bbf