Revert "Remove transcript versioning"
Revert "Remove transcript versioning"

This reverts commit d6195ea9ba7379a5ae4a14235baa78cf87632dc2.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode