minor changes to randmatmul that yield major speed-ups #406
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Total time has been reduced by around 65 to 75%.
The biggest improvement was in matmul, where it was previously adding to the array whilst summing up a series of values. Now it sums using a 'total' variable, with the array being updated at the end. This alone removed over 65% of the time.
I also moved to using Float64Arrays for matmul, which adds a little more speed.