Add default for subclassing
Add default for subclassing

rTreutlein/atomspace,misgeatgit/atomspace,AmeBel/atomspace,AmeBel/atomspace,rTreutlein/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,AmeBel/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,AmeBel/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,AmeBel/atomspace,rTreutlein/atomspace