emit SPARQL compatible CSV relation for rs:ResultSet

don't know why I get redundant declaration warnings for _csv_ function
delete duplicate line
Merge branch 'mkr-serializer'

emit SPARQL compatible CSV relation for rs:ResultSet
purpose of merge: replace previous detailed mKR relation
with a W3C standard compatible CSV relation.  The mKE
program supplies a default "meaning", but the user can
specify a custom "meaning" to translate the CSV relation
to a list of sentences.