FIX: Add clip limits to Nightshade floating point calculations #1989
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Depending on the values input to Nightshade, the floating point
precision could put the range for arccos outside of [-1, 1], which
in turn numpy returns as nan's, yielding bad geometries further
downstream. This patch clips the arccos calculations to [-1, 1] to
guarantee we aren't out of the valid floating point bounds.
Fixes #1988