Make face sweeping simpler and more flexible #2114
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This is a reversal of an earlier decision, and prepares for an upcoming simplification.
Make sure to create a face that will always end up an exterior face, regardless of surface coordinate system and direction of the sweep path. This is preparation for making the face sweeping code a bit dumber, but more flexible.
By always using the original face as the bottom, it should now be relatively straight-forward to create shells whose faces are facing inside. This is useful for creating cavities within a solid, for example.
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This came out of my work on #2098.