MRC:

* fixed various replication problems
* added '/babudb' subpage to status page that displays information about BabuDB

servers:
* updated BabuDB + replication plug-in to 0.5.4

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2609 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534