took out the previous fix for the track depth as it did not work as expected
took out the previous fix for the track depth as it did not work as expected

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