direct (no LUT) sigmoidal-contrast and remove re-declaration of index i
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+2012-09-10 7.0.0-0 Nicolas Robidoux <nicolas.robidoux@gmail...>
+ * Direct computation, without LUT, of sigmoidal-contrast.
+ * Fix re-declaration of i (at the top, and inside a conditional).
+
2012-09-04 7.0.0-0 Nicolas Robidoux <nicolas.robidoux@gmail...>
* Add tanh/atanh clone of legacy sigmoidal map (faster & more accurate).