Springify (modded Spring layout with CUDA kernel)

[Cvikli]

I find Spring layout sometimes too overcrowded at specified graphs. This layout algorithms sometimes gives a little bit better graph structure.
It uses CUDA for ordering as I need larger graphs sometime to order.

I know there are some works need to be done to be merged. But I hope it is a good start.

[hexaeder]

I did not have a closer look at the code yet. However, this adds CUDA as a dependency which is quite hefty and not usable by all people. I'd suggest, that a GPU accelerated layouts should live in a separate package like NetworkLayoutCUDA.jl and uses the interface for layouts...

[SimonDanisch]

Could this also be done with just GPUArrays?

[Cvikli]

@hexaeder you are right. CUDA sounds a little bit too big dependency. :( I don't see any other option than creating another package for it indeed.

@SimonDanisch Isn't that package somewhat deprecated... or unadvised to be used? Also if it is advised, would it solve our dependency issue? Also shouldn't we use it with kernelabstraction if so?