Revise comments, since the fnv1a stuff made them obsolete.
Revise comments, since the fnv1a stuff made them obsolete.

Also clean up the fnv1a code.

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