QUnit refactor

This patch release refactors QUnit (isSchmidtDecompose) for code clarity and reuse. No bugs have been fixed; no features have been added; the performance differential might be entirely negligible. However, the improvement in source code is authoritative.

Full Changelog: unitaryfund/qrack@vm6502q.v9.9.6...vm6502q.v9.9.7

sha1sum results:
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03107e1ea5739a5da340c935117e0dd1bc2d2214 pyqrack-1.30.8.tar.gz