Remove requirement that Axes == X && Axes == Y #9
There are a number of places in IJ2 where an algorithm assumes the x coordinate of a position array is at index 0 and the y coordinate of a position array is at index 1. Remove this assumption.
Might need to have a Dataset cache the xIndex & yIndex (or more appropriately uIndex & vIndex) and allow them to be queried. One could supply methods somewhere such as: