AltAlleleGroupAdaptor.pm: portability fixes.
AltAlleleGroupAdaptor.pm: portability fixes.

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