Typo in CNS calculation

[Robert Helling]

Willem,

could you please have a look at the final computation in static double calculate_cns_dive(const struct dive *dive)
in divelist.c

It seems to me that the first minus in

		cns += (double)t / ((double)cns_table[j][SINGLE_EXP] - ((double)po2i - (double)cns_table[j][PO2VAL]) * (double)cns_table[j][SINGLE_SLOPE] / 10.0) * 100;

should be plus (at least according to the formula in the comment above. At least, with this minus, you get negative CNS values for a planned air dive to 80m of depth.

Best
Robert

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