fixed Clang warnings

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


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiKernel@7189 22b0f739-a4da-4a50-9948-337547c35a65
fixed more Clang warnings

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


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiKernel@7196 22b0f739-a4da-4a50-9948-337547c35a65
Fixed Eclipse static analyzer warning.

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


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiKernel@7198 22b0f739-a4da-4a50-9948-337547c35a65
Added virtual destructors for IConverter and IConversionSvc.

It shoud fix issue CFHEP-87.
https://sft.its.cern.ch/jira/browse/CFHEP-87

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


git-svn-id: file:///afs/cern.ch/work/b/binet/dev/repos/gaudi-svn-mirror/Gaudi/trunk/GaudiKernel@7203 22b0f739-a4da-4a50-9948-337547c35a65