std.random and mersenne twister

[Andrea Fontana]

I read that default RNG in phobos is Mersenne Twister. 

I think it would be a good idea to replace it with
complementary-multiply-with-carry (cmwc). CMWC is faster (use simpler
math), has a longer period (standard implementation has a 2^131104
period vs 2^19937 of current MT implementation in phobos) and passed
diehard tests (mt passes them too)

And of course it's very easy to implement:
http://en.wikipedia.org/wiki/Multiply-with-carry#Implementation
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