PrimeGrid: Double checking is now required for all tasks

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PrimeGrid has turned on double checking for the SGS-LLR, PPSE-LLR, and PPS-LLR sub-projects. All of our other projects already had double checking enabled. More details and discussion can be found here: http://www.primegrid.com/forum_thread.php?id=7007

More... (http://www.primegrid.com/forum_thread.php?id=7009)