libxtreemfs: modified dir status and vivald visualisation page (link + message...

libxtreemfs: modified dir status and vivald visualisation page (link + message when no data is available + filter for 0-data)

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@3005 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534