fixed some mistakes in the protocol spec, added examples for headers,

added interaction diagram(s).
-- Diese und die folgenden Zeilen waerden ignoriert --

M    docs/XtreemFSProtocol.odt
AM   docs/Interactions.odg


git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@42 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534