Changed field linkage_type to varchar(3) instead of enum. Values will be tested in healthchecks.
Changed field linkage_type to varchar(3) instead of enum.
Values will be tested in healthchecks.

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