* major cleanup of server logging

  - log levels in the server have been unified with client log levels
  - log messages are now assigned categories, which makes it possible to restrict logging to certain domains, e.g. network, request processing or authentication
  - made logging more efficient by using string patterns rather than immediately assembling log messages
* cleanup: removed classes/packages that are no longer needed, e.g. for Pinky and Speedy

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@560 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534