corrected bug in Slice::subseq which did not correctly obtain sequence when slice sequence was manually loaded
corrected bug in Slice::subseq which did not correctly obtain sequence when slice sequence was manually loaded

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