Issue 312 use single config

[finozzifa]

Closes # (if applicable).

The code resolves point Use a single config file from Issue #312.

Changes proposed in this Pull Request

• add configfile in Snakefile
• replace c_onfig_pypsaearth with snakemake.config

Checklist

• [x] I tested my contribution locally and it seems to work fine.
• [x] Code and workflow changes are sufficiently documented.
• [ ] Newly introduced dependencies are added to envs/environment.yaml and envs/environment.docs.yaml.
• [ ] Changes in configuration options are added in all of config.default.yaml, config.tutorial.yaml, and test/config.test1.yaml.
• [ ] Changes in configuration options are also documented in doc/configtables/*.csv and line references are adjusted in doc/configuration.rst and doc/tutorial.rst.
• [ ] A note for the release notes doc/release_notes.rst is amended in the format of previous release notes, including reference to the requested PR.

[finozzifa]

I have exported the value of the objective function at the end of _solvenetwork.py when I execute

snakemake --cores all run_test

The code snippet is

with open("./data/objective_function.txt", "w") as obj_func_file:
  obj_func_file.write("Objective function: {} \n".format(n.objective))
  obj_func_file.write("Objective constant: {} \n".format(n.objective_constant))

Results obtained from the main branch

Objective function: nan 
Objective constant: 1862023.75

Results obtained from the issue_312_use_single_config branch

Objective function: nan 
Objective constant: 1862023.75

[davide-f]

This looks awesome to me! :D @finozzifa In my opinion we can merge it right away if CI runs.

As a comment, if you use vscode, I recommend to:

1. setup pre-commit: conda activate pypsa-earth pre-commit install
2. make sure that pypsa-earth is the default python env: from vscode: view->command pallette->python: select interpreter -> pypsa-earth

[finozzifa]

Hi @davide-f , thanks. It seems to me that all checks have passed and I already follow your recommendations on the environment and pre-commit. Thanks :)