Milkyway: Updated separation to 0.50

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I've updated the separation application to 0.50 for Windows, Linux x86/x86_64/PPC, and OS X x86_64/PPC. I've also added the Nvidia OpenCL application, but I'm not sure if the scheduler's been updated to automatically send it out. I also haven't yet removed the old CUDA one.This should fix the crashing of 17_3s workunits and a few other things.

More... (http://milkyway.cs.rpi.edu/milkyway/forum_thread.php?id=2107)