fail. This fixes it by sorting out the auto increment identifier

Due to changes in BaseFeatureAdaptor we need to save the state of
meta_coord otherwise a number of tests will begin to fail. Same is
true of xref.

if attribute already exists, not need to scream warnings

when removing slice, remove any attached assembly entries

if this is the last feature of its kind, delete corresponding meta_coord entry
if it was the longest feature of its kind, update meta_coord to second longest feature

if filename is specified, will save source to file rather than in an array
good for big downloads

returns the attribute object associated to a given statistic
updated POD documentation

if ignore release is set for the main xref, it should be inherited by the dependent xrefs as well

added data for transcript count in genome_statistics test data
added test for get_transcripts and get_alt_transcripts in genomecontainer

exists on gene object, now also on transcript object

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

checking total length, not ref