checking of the meta_key for 'xxxx'build.level and check if slice is toplevel to limit search in seq_regions

* changed schema version numner in meta table

* removed priority column from xref table

* added new table unconventional_transcript_association

* make analysis_id in analysis_description table unique

modified version of dump_genebank script to dump annotated scaffolds for Genbank - as used for v38 db and AgamP3 geneset 3

removed BOUNDRY CROSSED error message as this is not needed. The feature is ignored if it goes past a PER boundry for example but this is supposed to happen