MOO Wrapper BOINC Scheduler changes for multiple app version case

BOINC Scheduler has had problems sending different app versions to clients when there's multiple possible versions for a platform. For example, this happens when there's both OpenCL and Stream/CUDA or both 32-bit and 64-bit CPU app version available. To hopefully fix this our scheduler has been changed to send each app version until it has enough host specific speed samples. Only exception is when that version has been failing.

Please report any problems of getting work or having them fail more often in our forums. Thank you and happy crunching!

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