5-8cyls

[Philippe Hurbain]

I don't like 5-8, since it is equal to a 2-4 + a 1-8, but in this case I see the benefits.
But a half slope, like the one discussed in that thread, is better.

We need a way of naming them.

Not sure the half slope is a solution here. To be scalable it needs to eliminate the cylinder padding. But then this padding introduces a t-junction with neighbor 2-4cyls.
For now I'll use the 5-8, if we find a better solution I'll change.