fix parallelism for osx #499
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The defaults of multiprocessing are platform dependent, and the defaults for OSX and windows are different from those of unix. Furthermore, the code is currently written and tested assuming the "fork" (versus "spawn") method of creating new threads, and running the code on OSX leads to exceptions (see #498)
This PR simply changes the start-method to use "fork" which resolves the issue (for me)
closes #498