new entries for oxford platypus genes

-Added option in the load_registry_from_db() to load dbs from another version (usefull for production and debugging)
-new method load_registry_from_url() which parses a URL like mysql:://anonymous@ensembldb.ensembl.org and uses these values to call load_registry_from_db()

Parser for refseq matches , done via the entrez gene, and had a better priority than doing the sequence match

Script to insert genebuild.level (etc) keys into meta table if all genes are on toplevel seq regions. Also checks transcripts, exons and repeat features. The API can use these keys to optimise fetching significantly.

example HAP or PAR slices