Revise the filter API also.
Revise the filter API also.

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