In load_registry_from_multiple_dbs():   Initialize the merged registry with whatever is in the registry at   that point.  Suggested by Andy Yates (thanks!).
In load_registry_from_multiple_dbs():
  Initialize the merged registry with whatever is in the registry at
  that point.  Suggested by Andy Yates (thanks!).

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