OSD-replication:

- replication should work with different striping policies of replicas
 o but all policies must have the same stripe-size
 o different striping policies can't be tested yet, but RAID0 with different stripe-widths works

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@1008 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534