testing for existence of dirs; catching stderr in appropriate way
testing for existence of dirs; catching stderr in appropriate way

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