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Adding Dcr2Stacker stacker class#512

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Adding Dcr2Stacker stacker class#512
mredden wants to merge 1 commit intolsst:mainfrom
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@mredden mredden commented Mar 2, 2026

For adding a stacker to MAF that will calculate an estimated second moment (shape) contribution to images due to the differential chromatic refraction (DCR) across a band. This supplements the existing DcrStacker which calculates an estimated first moment, the zenith-ward shift of an image relative to it's unrefracted position, due to DCR.

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