fix to Transcript::get_all_peptide_variations (negative strand snps weren't correctly)
fix to Transcript::get_all_peptide_variations (negative strand snps weren't correctly)

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