New table alt_allele added and dumped in the xref table changed to an enum for ease of use/understabding
New table alt_allele added and dumped in the xref table changed to an enum for ease of use/understabding

james-monkeyshines/ensembl,muffato/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,at7/ensembl,willmclaren/ensembl,james-monkeyshines/ensembl,mjg17/ensembl,mjg17/ensembl,muffato/ensembl,mjg17/ensembl,at7/ensembl,at7/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,danstaines/ensembl,danstaines/ensembl,at7/ensembl,muffato/ensembl,danstaines/ensembl,muffato/ensembl,Ensembl/ensembl,Ensembl/ensembl,willmclaren/ensembl,mjg17/ensembl