lmfit/lmfit-py: 1.2.0

New features:

• add create_params function (PR #844)
• add chi2_out and nsigma options to conf_interval2d()
• add ModelResult.summary() to return many resulting fit statistics and attributes into a JSON-able dict.
• add correl_table() function to lmfit.printfuncs and correl_mode option to fit_report() and ModelResult.fit_report() to optionally display a RST-formatted table of a correlation matrix.

Bug fixes/enhancements:

• fix bug when setting param.vary=True for a constrained parameter (Issue #859; PR #860)
• fix bug in reported uncertainties for constrained parameters by better propating uncertainties (Issue #855; PR #856)
• Coercing of user input data and independent data for Model to float64 ndarrays is somewhat less aggressive and will not increase the precision of numpy ndarrays (see :ref:model_data_coercion_section for details). The resulting calculation from a model or objective function is more aggressively coerced to float64. (Issue #850; PR #853)
• the default value of epsfcn is increased to 1.e-10 to allow for handling of data with precision less than float64 (Issue #850; PR #853)
• fix conf_interval2d to use "increase chi-square by sigma*2reduced chi-square" to give the sigma-level probabilities (Issue #848; PR #852)
• fix reading of older ModelResult (Issue #845; included in PR #844)
• fix deepcopy of Parameters and user data (mguhyo; PR #837)
• improve Model.make_params and create_params to take optional dict of Parameter attributes (PR #844)
• fix reporting of nfev from least_squares to better reflect actual number of function calls (Issue #842; PR #844)
• fix bug in Model.eval when mixing parameters and keyword arguments (PR #844, #839)
• re-adds residual to saved Model result (PR #844, #830)
• ConstantModel and ComplexConstantModel will return an ndarray of the same shape as the independent variable x (JeppeKlitgaard, Issue #840; PR #841)
• update tests for latest versions of NumPy and SciPy.
• many fixes of doc typos and updates of dependencies, pre-commit hooks, and CI.