add intensional/extensional implication and equivalance link types
add intensional/extensional implication and equivalance link types

williampma/atomspace,ceefour/atomspace,rTreutlein/atomspace,inflector/atomspace,rodsol/atomspace,AmeBel/atomspace,rodsol/atomspace,AmeBel/atomspace,yantrabuddhi/atomspace,yantrabuddhi/atomspace,cosmoharrigan/atomspace,yantrabuddhi/atomspace,cosmoharrigan/atomspace,misgeatgit/atomspace,AmeBel/atomspace,ceefour/atomspace,ArvinPan/atomspace,misgeatgit/atomspace,ceefour/atomspace,misgeatgit/atomspace,williampma/atomspace,inflector/atomspace,ArvinPan/atomspace,inflector/atomspace,misgeatgit/atomspace,AmeBel/atomspace,rTreutlein/atomspace,williampma/atomspace,rTreutlein/atomspace,cosmoharrigan/atomspace,inflector/atomspace,AmeBel/atomspace,ceefour/atomspace,misgeatgit/atomspace,yantrabuddhi/atomspace,inflector/atomspace,rodsol/atomspace,yantrabuddhi/atomspace,williampma/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,ArvinPan/atomspace,rTreutlein/atomspace,cosmoharrigan/atomspace,rodsol/atomspace