🐛 Optimized parameters are missing StdErr when saved to file

[s-weigand]

Version information

• pyglotaran version: All
• Python version: All
• Operating System: All

Describe the bug

The optimized parameters from an analysis when saved to file are missing the StdErr, thus making the result incomplete.

To Reproduce

Run any example from the examples repo or the quickstart.

Expected behavior

The StdErr of optimized parameters is saved in the parameter file.

Screenshots

Example from the quickstart.

[s-weigand]

This will definitely collide with the changes in #896 and might also break the result comparison (we can always update those), so it will be best to add an optional argument to ParameterGroup.to_dataframe (e.g save_std_err: bool which can also be used to differentiate between initial_parameter and optimized_parameters)