Fix tundra.tn.derive derivative success log statement to use variable substitution for the derivative index
Fix tundra.tn.derive derivative success log statement to use
variable substitution for the derivative index

Permafrost/TundraTN,Permafrost/TundraTN,Permafrost/TundraTN,vr-aus12/TundraTN,vr-aus12/TundraTN,vr-aus12/TundraTN