begin using ocaml-rdf convenient functions to create rdf vocabulary
modify vocabulary
- update genet-genrdfs to use convenient function from rdf_rdfs
- use Grdfs.genet_usetoolversion instead of Grdfs.genet_useversion to link an instchain to a tool version
- use Grdfs.genet_portfrom instead of Grdfs.opfrom to get orginal port from a inst port
- add Grdfs.genet_flatopn class
- add Grdfs.genet_port class
update Changes