Improve CombineAncillae()

This release improves the case coverage of QStabilizerHybrid::CombineAncillae(), for overall simplification.

"Weak sampling mode" seemed bugged and had no significant overall benefit, so it has been (at least temporarily) removed.

File SHA-1 sums:

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Full Changelog: vm6502q.v8.16.2...vm6502q.v8.16.3