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Add Helix and PolarRepeat - #46
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Two shapes for RF drivers in 3D:
Helix(start, radius, pitch, turns, wire_radius, axis=..., left_handed=...): a helical wire of round cross-section with hemispherical ends (the copper tube of an RF coil). Its level set is the distance from the centreline, by Newton steps along it from the linearised minima of the two nearest turns: exact within a wire radius of the wire (tested against dense sampling of the centreline), the distance from the centreline's cylinder (a bound) farther away.yee_fractionsworks on it (sampled crossings refined on the level set).PolarRepeat(source, count, axis=..., origin=...):countcopies of a 3D shape about an axis, evaluated by folding the point's angle into the first sector. Membership and level set equal those of the union of rotated copies (tested), at the cost of one copy: the 24 slits of a Faraday shield,tube - PolarRepeat(slit, 24), make the cut cells as fast as one slit.Docs: the level-set table, the Numerics overview, the shapes tutorial and the changelog.