Add warning on merged branch
TEST: Fixed show_test_data/1.
FIXED: SPARQL 1.1 syntax issue handling MINUS.
ENHANCED: Store less data for processing MINUS
FIXED: Error in query: Type error: `atom' expected, found `literal(Hello, world!)'
Reported by Gniourf.
FIXED: COUNT(N) with optionals.  Romaric Pujol.
SECURITY: SPARQL update commands could be executed with only read rights.
Romaric Pujol.
Merge branch 'cpack' of https://github.com/SWI-Prolog/ClioPatria