servers: *added new method for getting OSDs to XLocations *added debug...

servers: *added new method for getting OSDs to XLocations *added debug operation to MRC *fixed ouput of ReusableBuffer on finalize * added new OSD cleanup infrastructure

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@351 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534