Revert "Use name, not display_label, as key for epigenomic data"
Revert "Use name, not display_label, as key for epigenomic data"

This reverts commit 169ca37f5c33a49320f5a86dcec155ef6ca0c35b.

Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode,Ensembl/ensembl-webcode