* MRC cleanup

* changed server logging infrastructure:
	- unified log levels (i.e. the same ones are used as in the client)
	- added support for categories (not yet completed)

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@516 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534