 Add unique key to meta_key/meta_value columns in meta table.
 Add unique key to meta_key/meta_value columns in meta table.

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