Since check_slope is now called implicitly when linking tracks together,
loading layouts with sloped tracks wasn't working properly.
if(links[0])
{
Vector epp = links[0]->get_snap_node(links[0]->get_link_slot(*this)).position;
if(links[0])
{
Vector epp = links[0]->get_snap_node(links[0]->get_link_slot(*this)).position;
else if(links[1])
{
Vector epp = links[1]->get_snap_node(links[1]->get_link_slot(*this)).position;
else if(links[1])
{
Vector epp = links[1]->get_snap_node(links[1]->get_link_slot(*this)).position;
+ position.z = epp.z-slope;