From Philippe:

This patch:
        a) add ClassDef to the generate TSelector with version 0.
        b) keep the Error message for all cases but those inheriting from TSelector
                (Warnings are not seems in the default rootcint mode).
        c) rootcint succeed in all cases (hence allowing user to compile
                classes that do not strictly implement the TObject interface).


git-svn-id: http://root.cern.ch/svn/root/trunk@5686 27541ba8-7e3a-0410-8455-c3a389f83636