Assertion list in the RecDef using xpath and groovy to check content.
Collecting StructureTest instances from RecDef for testing documents.
Integrated structure tests, showing them above the XSD error.
Integrated content assertions into MappingCompileModel
Using Saxon-HE 9.4.0.6, built central XMLToolFactory for instantiation, added ICN test of assertions.
Currently the integration in the app has XPath problems while the unit tests do not:  sanity in question.
Assertions now work.  DOMBuilder was constructing nodes but never attached the root element as documentElement.
Finding RecDefNode in MappingResultImpl with a proper path.
Prettier messages.
Launch file now aware of the latest Saxon-HE dependency
Version 1.0.0 (without snapshot) across the board.
Merge pull request #402 from delving/xpath-assertions

Xpath assertions