getLatest with digest

Following changes and additions has been made.
<ul>
<li>New remote procedure call GET_LATEST_WITH_DIGEST. A get latest call has the option to simultanously fetch a digest list with entries currently stored on the requested peer. Tested.</li>
<li>Bug fix in decoding digest results. Verified with tests.</li>
<li>Clearance in replication. As soon as a peer loses its replication responsiblity the data on this peer gets also removed.</li>
</ul>