changed to get variationfeatures from a slice
changed to get variationfeatures from a slice

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