checked the Arrays.parallelSort() method with the LT-World ontology to replace our special sort method used in Calc.join(): even slightly worse

v6.0.11: add support for adding new (XSD) datatypes without changing the code; new datatypes define mappings between datatype name and Java class in HFC; mappings need to be specified in namespace files; two new directives: &short2long and &type2class; examples can be found in default.ns file