CSPACE-12: Added a 'full' collectionObject schema in RELAX NG that includes, rather...

CSPACE-12: Added a 'full' collectionObject schema in RELAX NG that includes, rather than incorporating by reference, the serviceMetadata and defaultCollectionObject schemas.  This, in turn, was used as input to the 'Trang' utility to generate a W3C XML Schema (XSD) version of the collection object schema.  Also included two trivial utility scripts to wrap RELAX NG validation and RELAX NG-to-XSD generation.
NB: the XSD version of the collection object schema included with this commit does not include a CSpace- or Hello World-specific namespace.