add the auto_rescale_y on the GraphVisual model and make the depth of grid on GridVisual not relative to pixel width

[fabien-colonnier]

Add the option to have rescale y in the append and in the update function of the GraphVisual.
It has been tested when both x and y are updated simultaneously. In update, it is not supporting 2 y axis yet. Not test was made to check it

[optseb]

Just a fix required for the graph example, either to reset it back to x^3 or change the labels to say that dataset 1 is a graph of y = x

[optseb]

Oh, would it be a good idea and easy to throw an error if an update() was called with rescale_y set true to avoid unexpected behaviour?

[fabien-colonnier]

I tested and corrected to have the full support of auto_rescale in the update function and added the auto_rescale_fit to fit the y axis. It is more complicated in the x axis as it is shared for different curves.

[fabien-colonnier]

As I am writing this, I realize the auto_rescale_fit function doesn't handle multiple curves on one y axis. It will resize the axis according to the last dataset to be updated...

[fabien-colonnier]

I added a comment for now, as It means rechecking all the datasets or storing the min and max for each one... which is tedious...

[sebjameswml]

All looks good now.