Update one the bezier stuff ...

With a little bezier help:

    bezier_subdivision() will still divide points closer at sharper part of the
curve
    bezier_length()
    bezier_point_spread() evenly-spaced points along multiple paths
and
    bezPrism(exH,rm1,rm2,slices,Switch)
with width and height radius modifiers: 0-1 range = R*kappa thru R
> 1 is bowl-shaped

Design considerations:
Multiple entries for backbone points, triangulating up one side and down the
other, presents a dilemma of using a fast face-index search for normal addition
or VEq() and going 9 times slower.

Perimeters that have little shape-wise relation to the backbone are buggy, such
as this one required increment-rate-control at a critical point along the path.

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