[Suggestion] Curve the npeghole primitives

[Gerald Lasser]

It is defined as an extension of normal resolution of tang (this is the proper way to do it to allow direct normal -> hires substitution). But then at lo res this become meaningless.

As there is no prim substitution doen on the level of lo res prims, then we do not need a tang, imho.

PS: the end-condlines of 8/3-8cylo are wrong

Edit: Attached the sample