Expose `GetPowderPatternObsSigma` and `SetPowderPatternObsSigma`#84

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clemisch wants to merge 3 commits intodiffpy:mainfrom

Commits on Jan 16, 2026

Add SetPowderPatternObsSigma to ObjCryst and expose GetPowderPatternObsSigma/SetPowderPatternObsSigma in the Python bindings
clemisch
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Commits on Feb 2, 2026

Add test for GetPowderPatternObsSigma/SetPowderPatternObsSigma
clemisch
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Commits on Feb 3, 2026

add news/main.rst
clemisch
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