Re: OpenMP and Nim

[perturbation2]

I know that @mratsim was able to get it working in 
[ArrayMancer](https://github.com/mratsim/Arraymancer/) (i.e., see 
[openmp.nim](https://github.com/mratsim/Arraymancer/blob/dd443279f4dd759d450728c2d84dc700bd9b0c7e/src/arraymancer/backend/openmp.nim))
 for some examples, but I'm not sure how more advanced usage would work.