QBdt and BigInteger debugging and performance

QBdt and BigInteger (alias bitCapInt) have been debugged. Additionally, one should see drastically improved performance with QBdt (despite significantly reduced parallelism utilization). Systemically, on GNU/Linux, the bitCapInt type now uses 128-bit "words" rather than 64-bit words, which should lead to some performance improvement.

Note that previous releases were almost universally built with capacity for 4095 qubits in a single simulator instance; in practicality, little besides stabilizer simulation can take advantage of the vast majority of this addressing capacity. This release limits to 127 qubits in a single simulator instance, but this is a "feasible" width for Qrack approximation techniques, and performance benefits from the change.

Full Changelog: vm6502q.v9.9.28...vm6502q.v9.9.33

sha1sum results:
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