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fix #16755: plot3d polygon facets may be incorrectly rendered when exactly in horizontal or vertical plane

Stéphane MOTTELET requested to merge mottelet/scilab:bug_16755_new into 6.1

This commit removes a corner case checking by computing the normals up to a specific TOLERANCE. The previous implementation relates to issues #15995 (closed), #13725 (closed) and #8310 (closed); this one keeps them fixed.

Edited by Clément DAVID

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