Can now handle multiple GenomeDBs with the same taxon_id
Can now handle multiple GenomeDBs with the same taxon_id

This is a generalization of the code that was used to handle component GenomeDBs (for polyploid species)

Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,Ensembl/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara,danstaines/ensembl-compara