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Add longitudinal position residual #196

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bonventre
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This all looks good.
At first I was wondering why you didn't use PointClosestApproach for the residuals when there's a 3-D constraint, but then I realized the errors are too asymmetric for that to work, what you coded is better. I'm thinking we should bundle all the ClosestApproach derivatives (dDdP, dTdP, and now dLdP) into one tensor/struct, but as long as the DOFs are independent it probably doesn't buy much, besides making the interface cleaner. Lets see what this looks like in the Mu2e code, then we can discuss possible consolidations.

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is more activity planned for this PR?

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I'm working on alignment interface which may supersede some of these changes

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