Add BITUTest::test_expand_2() for testing Rule::unify_target
Add BITUTest::test_expand_2() for testing Rule::unify_target

inflector/atomspace,AmeBel/atomspace,inflector/atomspace,misgeatgit/atomspace,rTreutlein/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,inflector/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,yantrabuddhi/atomspace,AmeBel/atomspace,misgeatgit/atomspace,misgeatgit/atomspace,AmeBel/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,AmeBel/atomspace,inflector/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,inflector/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,yantrabuddhi/atomspace,rTreutlein/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,ArvinPan/atomspace