If this method normally returns an array, why return a hashref on failure?
'Possible orthologues' is no longer a valid category
Remove 'possible orthologues', as no longer in use
Implement OrthoXML export for paralogues
Merging postreleasefix/78 to master

* postreleasefix/78:
  Implement OrthoXML export for paralogues
  Remove 'possible orthologues', as no longer in use
  'Possible orthologues' is no longer a valid category
  If this method normally returns an array, why return a hashref on failure?