eWaterCycle: Add recipe to prepare input for HYPE

[ipelupessy]

Short description of the diagnostic
Convert ERA-Interim and/or ERA5 meteorological input data to a format that can be used as forcing data for the HYPE hydrological model. This is part of the preprocessing workflow in the eWaterCycle project.

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Tasks

• Create an issue to discuss what you are going to do, if you haven't done so already (and add the link at the bottom)
• Make sure your code is composed of functions of no more than 50 lines and uses meaningful names for variables
• Circle/CI tests pass. Status can be seen below your pull request. If the tests are failing, click the link to find out why.
• Preferably Codacy code quality checks pass, however a few remaining hard to solve Codacy issues are still acceptable. Status can be seen below your pull request. If there is an error, click the link to find out why. If you suspect Codacy may be wrong, please ask by commenting.
• Please use yamllint to check that your YAML files do not contain mistakes
• n/a (Only if really necessary) Add any additional dependencies needed for the diagnostic script to setup.py, esmvaltool/install/R/r_requirements.txt or esmvaltool/install/Julia/julia_requirements.txt (depending on the language of your script) and also to meta.yaml for conda dependencies (includes Python and others, but not R/Julia)
• n/a If new dependencies are introduced, check that the license is compatible with Apache2.0

New recipe/diagnostic

• Add documentation for the recipe to the doc/sphinx/source/recipes folder and add a new entry to index.rst

Closes #1335

[valeriupredoi]

one change and one question. Cheers for adding this! 🍺

[bouweandela]

Could you please merge the version2_development branch into this branch, so the unit tests on CircleCI work?

[ipelupessy]

circleci fails, but on existing (style) issues...

[ipelupessy]

ok, it still needs a few changes in the diag_script with respect to formatting and units..

[Peter9192]

@ipelupessy could you add support for the ERA5 dataset as well (see https://github.com/ESMValGroup/ESMValTool/blob/pcrglobwb_era5_recipes/esmvaltool/recipes/hydrology/recipe_pcrglobwb.yml for an example). Basically, it boils down to this:

• Add preprecessors for hourly data (duplicate yours and add daily_statistics)
• Add a diagnostic for hourly data (duplicate yours and use the additional_datasets keyword within each of the diagnostics, rather than the top level datasets specification.

[ipelupessy]

@Peter9192 you zapped me from the contributors list, this breaks the recipe ;-)

[Peter9192]

Sorry 'bout that @ipelupessy , I was under the impression that you would already be listed in my copy of the development version. It's quite annoying that there are so many versions of this file in various branches. Actually, there is an issue about this: ESMValGroup/ESMValCore#28

[ipelupessy]

@bouweandela, @valeriupredoi as far as i can see this is good to merge (but maybe I am overlooking something...)

Done