Move the force-draw curve to a dedicated tab in the result viewer

[stfnp]

Right now, the force-draw curve can only be viewed under "other plots" by combining the relevant data series. Since the draw curve is quite important, it might be good to move it to its own tab. That would also open up the possibility to customize the plot and add some additional information. Some ideas:

• Optionally show a straight line from the start to the end of the draw curve for comparison
• Optionally show the stiffness (derivative) of the draw curve in the same diagram Add some derivatives of static results to the output #128
• Optionally show the energy (integral) of the draw curve

This tab would have no equivalent for dynamics, but maybe something similar could be done about arrow position, velocity and acceleration, since those might also be worth emphasizing. Alternatively, the draw curve could be integrated with the "Energy" tab in the static case.