Added check for identical oligo_array/external_db names
Added check for identical oligo_array/external_db names

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