Add capability to track particles on rotated DISV MF6 grid. #23
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Intended behaviour: when a grid does not meet requirements (smoothed & rectangular):
1/ rotate the DISV grid,
2/ track particles on the rotated grid (no modifications),
3/ un-rotate the results (pathlines/endpoints/timeseries).
I did not use the (OriginX, OriginY, RotationAngle) features in the output files' headers because it might raise other issues.
Comments & improvements are welcome!