exists on gene object, now also on transcript object

- Added 'sql_file' option to be able to specify the 'sql.txt' file name.

generated test data for patch test database
database patched up to release 75

creation of a new genome_statistics table

checking total length, not ref

Added method count_all_by_biotype as in GeneAdaptor.

Deprecating the fetch_nearest_Gene_by_Feature() method. It is unreliable and a replacement is being developed

revisions to CliHelper to support dbs where no production name is set, and to improve default behaviour where single_species mode not specified. Also expanded test coverage to support this, adding the nameless and test_collection test dbs for this purpose

the addition of column 'source' to transcript table.

Add column source in a specific order so the table definition comparison between a patched db and current one succeeds