Improve config console logger: Allow stderr and improve multiline format (#395)

* Add some validation to config.py

* Improve file Permission handling in config.py

* Remove unwanted return

* Improve Docstrings in config.py

* Improve Docstrings in config.py

* Typo

* Use code block in docstring

* Allow stderr for console logging

* Make docstrings more compact

* Make docstrings more compact

* Updated to actually use stderr

* Simplify format()

* Improve format

* Add extra validation

* Update CHANGELOG.md

Author: FBumann

CHANGELOG.md

@@ -96,6 +96,10 @@ This replaces `specific_share_to_other_effects_*` parameters and inverts the dir
 - Improved Model Structure - Views and organisation is now divided into:
     - Model: The main Model (linopy.Model) that is used to create and store the variables and constraints for the flow_system.
     - Submodel: The base class for all submodels. Each is a subset of the Model, for simpler access and clearer code.
+- Made docstrings in `config.py` more compact and easier to read
+- Improved format handling in configuration module
+- Enhanced console output to support both `stdout` and `stderr` stream selection
+- Added `show_logger_name` parameter to `CONFIG.Logging` for displaying logger names in messages
 
 ### 🗑️ Deprecated
 
@@ -133,6 +137,7 @@ This replaces `specific_share_to_other_effects_*` parameters and inverts the dir
 - Enhanced NetCDF I/O with proper attribute preservation for DataArrays
 - Improved error handling and validation in serialization processes
 - Better type consistency across all framework components
+- Added extra validation in `config.py` to improve error handling
 
 ### 📝 Docs
 

flixopt/calculation.py

@@ -250,9 +250,8 @@ def solve(
 
         # Log the formatted output
         if log_main_results:
-            logger.info(f'{" Main Results ":#^80}')
             logger.info(
-                '\n'
+                f'{" Main Results ":#^80}\n'
                 + yaml.dump(
                     utils.round_nested_floats(self.main_results),
                     default_flow_style=False,