#284 Add diagnostics to SCH engine to support assert/report types/categories

[Kai U. Heitmann]

Add diagnostics to SCH engine to support assert/report types/catgeories of errors/warnings
E.g.: like a "cardinality element reuqired 1x" ASSERT throws:
E [ISO Schematron] (CDArecordTarget): element hl7:patientRole is required [min 1x]. Diagnostics: [CPR] Cardinality: Particle Required This also allows filtering or even disable certain categories of assert/report