Don't consider faces equal under cyclic permutation by default #241
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In 0.5 we changed the hash and == functions to consider faces equal under cyclic permutation of their indices. E.g.
(i, j, k) == (j, k, i)
. This leaves the involved vertices, the winding direction and the shape of the face the same, at least for 2D faces.This pr reverts that change by moving that functionality into new functions. Equality and hashing require equal ordering after this. I'm not sure if we want the pre or post 0.5 functionality here, but if we do we can merge this.