Fix freezing functionality for constraint nuisances; modify external postfit functionality; update likelihood scan#97

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davidwalter2 wants to merge 2 commits intoWMass:mainfrom

davidwalter2:260108_upd

Commits on Jan 9, 2026

Allow to use externalPostfit as starting point for fit; profile beta parameters after loading externalPostfit
davidwalter2
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Fix feezing of constraint parameters; using freezing functionality in likelihood scans
davidwalter2
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