Optimize and debug "reduced density matrix" methods

In addition to a minor bug fix, ProbAllRdm() has been optimized and gained a parameter to control whether buffered RZ gates are rounded down to no-operation from phase angles between -Pi/8 and Pi/8. This has also been exposed in the shared library API.

File SHA-1 sums:

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Full Changelog: vm6502q.v8.16.1...vm6502q.v8.16.2