Reduced size of xref.display_label to keep size of index down.
Reduced size of xref.display_label to keep size of index down.

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