added missing columns to mapset and external_db
added missing columns to mapset and external_db

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