Fix for linked datavars #393
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In our model setup, we handle a special case where certain nodes depend on fixed inputs. Instead of making a new node, we connect them directly to the input. This saves us from writing rules for passing messages and just uses the fixed input values. But, there was a bug. It only worked for marginal calculations, not for messages. This update fixes that, making sure all calculations use the linked inputs, and adds a few tests to make sure it works.
Initially found by @ismailsenoz