Square plots on APSIM.POStats.Portal

[BrianCollinss]

Describe the new feature

Would be better to have square plots (i.e., same range on X and Y axes; 1:1 line be at 45 degrees; easier to visually interpret)?

[hut104]

... and have the 1:1 line black.
... and have a line of best fit for both series.