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Set the macromolecularSize fields of the parsed bioassemblies.
This can only be called after the full PDB file has been read so that
all the info for all bioassemblies has been gathered.
Note that an explicit method to set the field is necessary here because
in PDB files the transformations contain only the author chain ids, corresponding
to polymeric chains, whilst in mmCIF files the transformations
contain all asym ids of both polymers and non-polymers.