Document external data table paths in various contexts

[popescu-v]

• In train_predictor, SNB_ or Baseline_-prefixed model dictionaries are generated. Similarly, in train_recoder, R_-prefixed model dictionaries are generated.

• In deploy_model, these prefixed dictionaries must be used, even for external tables.

• However, in evaluate_predictor, the original names must be used for external tables, in order to support evaluating several predictors.

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