merge updates from 2.4.2 changes
update documentation for trunk to use 2.5.0 release number
remove semantic annotation proposal - moved to github: https://github.com/DataONEorg/sem-prov-design/blob/master/docs/use-cases/semantics/semantic-annotation.md
add more sections about extending the annotation model, serializations, and permissions.
Added more description for the model. cleaned up a few formatting issues.
draft of semantic model documentation
Fixed an error in the ORE model diagrams
Describe the primary data resource in the derived resource RDF
expand the sparql queries to include dcterms:identifier
Text changes to ORE docs
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