Added get_all_homologous_Genes to Bio::EnsEMBL::Gene that returns the Bio::EnsEMBL::Gene and Bio::EnsEMBL::Compara::Homology objects for each corresponding homologous gene in the Compara DB. Changed EnsEMBL::Web::Data::Gene to use this call with the benefit that the Compara DB gets hit obce only per GeneView request