[ENSWEB-5706] Allow multiple "ancestral" databases in the Registry
[ENSWEB-5706] Allow multiple "ancestral" databases in the Registry

Ancestral databases are now registered with their division name,
preventing a clash between the Plants and Vertebrates databases.

Note that for backwards compatibility and for consistency with the
rest of the code, the name "Vertebrates" is currently omitted.

james-monkeyshines/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,Ensembl/ensembl