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Fix #276: Implement xoroshiro128**

Raymond Toy requested to merge issue-276-xoroshiro128starstar into master

As mentioned in #276 (closed), our implementation of xoroshiro128+ is out-of-date and has been superceded. Since we have to change the algorithm anyway, we're updating the implementation to xoroshiro128**.

This is implemented on x86 as a VOP. For other architectures, we have a Lisp version. It's a bit slower (on x86), but it generates the correct values.

Edited by Raymond Toy

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