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skip database with message if already has a mapping for this release

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