Adapted emission limit

[hazemakhalek]

Closes # (if applicable).

Changes proposed in this Pull Request

Checklist

• [ ] I tested my contribution locally and it seems to work fine.
• [ ] 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.

[energyLS]

The implementation from PyPSA-Earth works, as shown here: #204. @hazemakhalek Feel free to send me one or a couple of networks with different CO2 limits using the emission limit proposed here, and I am happy to do the same analysis for these networks.

[energyLS]

Closed, other (cleaner) implementation done in #207. Also, some changes regardintg monthly matching of hydrogen are implemented here, but are also done in #198