Equation handling for 1.9
Better Equation handling is currently planned for 1.9. I'd suggest we handle these separated in two cases:
- GeneratedFunctionItem: An item inheriting from DataItem, but containing metadata to generate the x and y data. Can be regenerated by user manually.
- FunctionItem: A new item type, that has "infinite" datapoints (in practice we generate enough for the current view). This item will not be modifiable by most operations