added BenchmarkStats.fs to Test.Alea...MGPU

Deleted most of the sample stats comments from scan & bulkremove tests.
Ran moderngpu benchmarks on dirac computer, saved results to desktop of
dirac computer.
Formatted all results into BenchmarkStats.fs.  Will access stats from
here for comparison.  I also saved the old results from my computer (gtx
560 Ti)