Potential bug in the assignment of fixed positions to chains

[ahof1704]

I think the indices for the fixed positions should be for chain B here, no?

        self.fixed_res = {
            self.chains[0]: fixed_list,
            self.chains[1]: []
        }

As it is, it seems to be assigning the fixed positions to chain A, while everywhere else we assume chain A contains the binder. Please let me know if I am misunderstanding this.

Thank you for the great resource!