added update_params to links to expand/collapse nodes so that we don't need to reload the whole page when these are clicked
added update_params to links to expand/collapse nodes so that we don't need to reload the whole page when these are clicked

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