deleted outdated owldoc
Merge branch 'master' of https://github.com/nmrML/nmrML
deleted obsolete classes, purgatory terms stay for the moment. Deleted UO and PATO imports as these only confuse users and we dont need it in the nmrCV itself as we do not axiomatise with UO. I addes skos metadata as an example to the "data file" term. For that metadata annotation skos was temporarily imported from http://www.w3.org/2009/08/skos-reference/skos.rdf
Then the skos annotation properties were used on 'data file' and then the skos import was deleted again to remove all unused skos classes and references. The advantage of skos over IAO annotation properties is that bioportal used skos as well.