QBdt debugging

QBdt error amortization suffered from an out-of-precision bug; this has been (completely) fixed.

(Note that release number is being considered semantic relative to artifacts.)

Full Changelog:
unitaryfund/qrack@vm6502q.v9.9.22...vm6502q.v9.9.23
v1.30.16...v1.30.20

sha1sum results:
8ea967abbc437f8cf9cb4ff43d9dd28b14e0094a pyqrack-1.30.20-py3-none-macosx_12_0_x86_64.whl
6acf6699f14ebba9f5cbb7f4d8a861f009a03cc8 pyqrack-1.30.20-py3-none-macosx_13_0_x86_64.whl
b85d347541b76ef33b76e96904a07e1ecacbde42 pyqrack-1.30.20-py3-none-macosx_14_0_arm64.whl
4a7d741a20d1e00442fd0941f6f72ad8dacda0a6 pyqrack-1.30.20-py3-none-manylinux_2_31_x86_64.whl
4d7649cc9c0aa4156b479b2670365e9c1825d5fa pyqrack-1.30.20-py3-none-manylinux_2_35_x86_64.whl
55e9150f8efee98efa40b41c7ba3c1f584e4d05e pyqrack-1.30.20-py3-none-manylinux_2_39_x86_64.whl
78e7c64bf647d0462bb429c0b161387a4cd02021 pyqrack-1.30.20-py3-none-win_amd64.whl
cb98691c23d528189335230a679c876240ebd858 pyqrack-1.30.20.tar.gz