Allow User to set Axis Ratio on Layer level

How to...

1. Go to the plot detail of a graph. Select the Size/Speed tab under the layer level.

2. When the box before Link Axis Length to Scale with X:Y is checked, we can link the graph axis length to the scale by any ratio.

Before linking the size to scale.

Set the link ratio to 1, axis length to scale ratio is the same for x and y.