support combining frozen models into a pairwise DPRc model #2902
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The "frozen" model has been previously supported in #2781, so this PR allows it to be used in the pairwise DPRc model.$N$ type maps of the whole models, as the QM model doesn't need MM types.
Allow QM model type maps to be just the first
One can load two separated models into one model or load the existing QM model and train the rest of the model.