Fix issue when updating metrics in graphs
Fix issue when updating metrics in graphs

 * Prevent issues with non-renamed series
 * Remove old metrics from groups/stacks when updating

hirocaster/facette,vovkasm/facette,iaean/facette,psytra/facette,hirocaster/facette,facette/facette,yonglehou/facette,hirocaster/facette,facette/facette,yonglehou/facette,githubert/facette,githubert/facette,yonglehou/facette,vovkasm/facette,facette/facette,iaean/facette,githubert/facette,iaean/facette,psytra/facette,psytra/facette,facette/facette,vovkasm/facette