-Replication: changed mutual-exclusion mechanism of the replication-frontEnd;...

-Replication: changed mutual-exclusion mechanism of the replication-frontEnd; dealt with a bug on incrementing the viewId; 

git-svn-id: https://babudb.googlecode.com/svn/trunk@98 d4c7dd96-b7b2-11dd-893d-d98698f66bbf