Added changes in shared functions necessary for schlund20esd

[schlunma]

Changes to shared modules and functions necessary for recipe_schlund20esd.yml.

The following recipes are affected:

• recipe_schlund20jgr_gpp_abs_rcp85.yml
• recipe_schlund20jgr_gpp_change_1pct.yml
• recipe_schlund20jgr_gpp_change_rcp85.yml
• recipe_cox18nature.yml
• recipe_ecs_constraints.yml

I successfully tested all of them, but it would be nice if someone else can check recipe_ecs_constraints.yml and recipe_ecs_constraints.yml.

• Addresses: Add recipe for Schlund et al., ESD (2020) #1916

---

Before you get started

• ☝ Create an issue to discuss what you are going to do

Checklist

It is the responsibility of the author to make sure the PR is ready to review. The icons indicate whether the item will be subject to the 🛠 Technical or 🧪 Scientific review.

• 🛠 PR has a descriptive title for the changelog
• 🛠 Code follows the style guide
• 🛠 Documentation is available
• 🛠 YAML files pass pre-commit or yamllint checks
• 🛠 Circle/CI tests pass
• 🛠 Codacy code quality checks pass
• 🛠 Documentation builds successfully on readthedocs

New or updated recipe/diagnostic:

• 🛠 Provenance information has been added
• 🛠 New dependencies are added to the project requirements
• 🧪 Documentation for the recipe/diagnostic clearly describes what it calculates from a scientific point of view
• 🧪 Recipe runs successfully on @esmvalbot or some other machine without modification
• 🧪 Figure(s)/data look as expected
• 🧪 Code is well documented and scientifically sound

---

To help with the number pull requests:

• 🙏 We kindly ask you to review two other open pull requests in this repository

[axel-lauer]

I just tested recipe_cox18nature.yml and recipe_ecs_constraints.yml. Both ran successfully and the output looked fine.

[schlunma]

@esmvalbot please run recipe_cox18nature.yml

[esmvalbot]

Since @schlunma asked, ESMValBot will run recipe recipe_cox18nature.yml as soon as possible, output will be generated here

[esmvalbot]

ESMValBot is happy to report recipe recipe_cox18nature.yml ran OK, output has been generated here

[schlunma]

@nielsdrost the esmvalbot worked perfectly fine here 👍

@axel-lauer I will not address the remaining Codacy issues since these would overly complicate the files. Do you approve the changes? It would be nice to get this merged soon so I can get the actual recipe for the paper in.

[axel-lauer]

Looking good!