ENSCORESW-160. Committed with test cases checked in. Also manually verified the code works with transcripts (live as of v67 of Ensembl) ENST00000330803, ENST00000366472 and ENST00000318244

ENSCORESW-171. Bringing in support for splice site work. We also had to change the intron table SQL as it was out of date.

Patching issue with there being a difference between NULL and and empty string WRT description and also plugged a gap in the code when we were trying to query using a display_label which the api allows to be NULL but the DB does not

ENSCORESW-165. Committing the second attempt at the IntronSupportingEvidence API for genebuild RNASeq data.

Auto-increment IDs means we cannot guarentee/reset the DB every time so assert that we were given an id

Added efficiency boost to fetch_all_by_external_name and sub-methods. Wildcards now escaped in positions 1 and 3 unless user supplies override flag.

POD updated accordingly.

Xref table overhaul. Uniqueness enforced, coupled with insert-then-query execution order in DBEntryAdaptor.

Data patching is slow.

Adding the no_alias check to the get_species_and_object_type() method to avoid warning about the lack of a lookup DB

load_registry_from_db - load the stable ids lookup database if found; get_species_and_object_type - use the stable id lookup database if found

ENSCORESW-159. Fix for issue found with coding_region_start which was using the wrong method in the transcript object.