fixed bug #101513: Raw->Raw processing should not print an error

Added the property DisablePFNWarning to silence the ERROR message about
files opened by their physical name.

https://savannah.cern.ch/bugs/?101513

From: Marco Clemencic <marco.clemencic@cern.ch>


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiUtils@7238 22b0f739-a4da-4a50-9948-337547c35a65