A few people have requested Micro Collatz work units for CPUs on Windows and Linux. Because not everyone wants them due to their short duration, I have added logic such that it will send the Micro work units only if the Measured Integer Speed is 4294 million ops/second or less. That number was chosen as it equates to that of a Intel E2160 Core 2 Duo running @ 1.8Ghz which is the slowest CPU I currently own but capable of running the Mini Collatz work units. In other words, it was a somewhat random choice and can be easily changed if the consensus is to make it either larger or smaller. The goal is so that those with older slower CPUs can receive Micro Collatz work units and complete them in a reasonable amount of time while keeping faster CPUs crunching for > 30 minutes. So, please let me know if this change causes any problems.

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