servers: *TimeSync can now synchronize with GPSd *client has support for...

servers: *TimeSync can now synchronize with GPSd *client has support for replica creation, deletion and maintenance *scrubber works with replicas *new xtfs_chstatus tool to mark servers as dead

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@1497 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534