Squashed 'subtrees/dagflow/' changes from ded618f19..7cbf4e41a

7cbf4e41a Merge commit '8d4d0efee36ba37b566c850c3fbc5a676238d450' into feature/pars-gindex
8d4d0efee Squashed 'subtrees/dictwrapper/' changes from a9677d6..ded618f
1334c93d2 feat: load_parameters, properly setup chi2

git-subtree-dir: subtrees/dagflow
git-subtree-split: 7cbf4e41a4c33c83d1f072bf720f0f1b3915816d