Example:
| Shear Velocity | -> | -1 |
| Porosity | -> | 2 |
| Grain Density | -> | -3 |
would be sorted: First according to Grain Density in
descending order. All values with the same Grain Density would be sorted after Porosity
in ascending order. All values with the same Grain Density and Porosity would be sorted
after Shear Velocity in descending order.
Since we use positive and negative values to
denote the sorting direction, "0" is not allowed as a sort key.
Without sorting options the program will try to find a reasonable sorting order itself.
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