QBdt debugging

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

Full Changelog: vm6502q.v9.9.22...vm6502q.v9.9.23

sha1sum results:
d31a4dd5624ae32eac6fde9c0e5d1ba4ae55113c libqrack-macosx_14_0_arm64.zip
507e8f2ec40cb82420dd9a644c4c2963b873cf1d libqrack-manylinux2014_x86_64.zip
62f7ac48c1a6f3b1e274984c775873801f393e82 libqrack-manylinux_2_35_x86_64.zip
ced693d326d76e82889fc9b5be0fe29b5e5eda7d libqrack-manylinux_2_39_x86_64.zip
f8bb6f5f5f874127b5b899b974fe6b2f86198b41 libqrack-win-amd64.zip