Additional output is incorrect when FP count simulation is active

[ptosco]

Simple reproducible:

from rdkit import Chem
from rdkit.Chem import rdFingerprintGenerator

smiles = 'OCCCCCCN'
mol = Chem.MolFromSmiles(smiles)

generator = rdFingerprintGenerator.GetTopologicalTorsionGenerator(fpSize=2048, torsionAtomCount=6)
additional_output = rdFingerprintGenerator.AdditionalOutput()
additional_output.AllocateBitPaths()
fingerprint = generator.GetFingerprint(mol, additionalOutput=additional_output)
bit_paths = additional_output.GetBitPaths()
print('bits', [bit for bit in range(2048) if fingerprint[bit] > 0])
print('additional_output', list(bit_paths.keys()))

bits [1576, 1716, 1960]
additional_output [394, 429, 490]

The bits are 2048-based in the returned fingerprint, but only 512-based in the additional output, which is inconsistent.

[greglandrum]

Changing the milestone for this since it's too dependent on the additions made in #5748, which is scheduled for 2023.03