New cyli, cylo and ring primitives.

[Philippe Hurbain]

I created these primitives with the purpose to avoid the rotation of the corresponding ones. I hope they can be approved. If not, I send an email to the PT Admin for deletions.

I can see the rationale, as I often split round prims to avoid the need to rotate them, but the number of needed variants is so high (and become unmanageable for hires prims!!!)