trackhub sprint 17: fix userlocation, implementing popup functionality for state on/off, removing redundant code for row/column switch, implementing reset
trackhub sprint 17: fix userlocation, implementing popup functionality for state on/off, removing redundant code for row/column switch, implementing reset

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