Added at least comments to most (if not all) terms to be used for MIAPA-compliant reporting. Added one usage example. Also changed hierarchy and labels of some data properties for which an existing superproperty in CDAO was overlooked.
Minor fixes, including adding a prefix for dcterms, and obviating the need to encode an apostrophe.
Merge pull request #1 from miapa/usage-annotations

Adding usage annotations, round 1.