* internal server errors will now cause EIO to be sent to the client

* moved ErrNo interface to org.xtreemfs.foundation package (used everywhere)
* fixed some auto_test issues, added timing info to the test log

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@423 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534