ENSCORESW-909: only map miRBase and RFAM if biotype like '%RNA%'
[ENSCORESW-827] a big ID slipped through the net.
ENSCORESW-919: official gene name not transfered onto canonical transcript
all transcripts will get gene name with -201 extension
ENSCORESW-925: ignore non numerical extension to _bak tables
ENSCORESW-914: idesc should really be xref.description field
ilabel added for xref.display_label field
ENSCORESW-926: add update method for sliceAdaptor