Fix oc_to_string of Unify
Fix oc_to_string of Unify

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