Collective changes

1removed double quotes " " in the definitions
2changed rdf:IDs to NPO codes or external IDs
3added rdf:label for all classes using preferred name of the respective classes
4replaced has_participant with derives_from in subclasses of covalent linkage
5replaced has_output_participant with part_of in subclasses of covalent linkage
6modified definitions in subclasses of linkage whereever appropriate for sake of clarity
7removed all associations from/to subclasses of ANTICANCER DRUG BASED ON TARGET