For each calibration request read, a new ReferencePoint was created in
Stock. This is because of the behaviour of unordered_set: as pertaining
to unordered_set, two elements are not considered equal if the hashes
alone are identical, they must also be actually equal (operator==).
The problem was fixed by using a custom equality check function that
checks the equality only on the coordinates of the ReferencePoint (as if
it was a Point3D).
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