- meaningful termination messages in case of error
- non-zero return code in case of finalization error

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


git-svn-id: svn+ssh://svn.cern.ch/reps/gaudi/Gaudi/trunk@6783 53ecefc3-a64d-0410-9bdf-b8581fa3287e