node_perform_pert should take and pass scaling information

[kkevlar]

node perform pert and functions it calls like node calculate arbitrary target using scale type() and node calclate global target using transformation type() should take scaling information.

It should take the following scaling information:

• Scaling Type (A / B)
• Gaussian Distribution Standard Deviation
• Gaussian Distribiton Height

The traj-info->selection struct stores these values currently, but they would make more sense as a parameters of this function.