Tuple - Tuple with three values:
- Item 0: Global senior fraction
- Item 1: Global junior fraction
- Dictionary of junior, senior and total fractions keyed by CELL_INT (grid cell id),
DIV_SUM (Total diversions per cell), SR_SUM (Total senior diversions per cell),
SR_FRAC (Senior fraction), JR_FRAC (junior fraction), EST_FLAG (flag used for
estimating values in cells without diversions), CELL (row column tuple).