Added restart points and automatic restart support

[tscheypidi]

🐦 Description of this PR 🐦

After this update the model will create restart files after each time steps and use these files if the model is stopped at some point and restarted (previously a restarted model would start again from the first time step)

In addition:

• fixed a merge mistake in CHANGELOG.md
• added standby and priority qos-setups with 24h limit (relevant for runs close to a cluster maintenance window)

🔧 Checklist for PR creator 🔧

• Label pull request from the label list.

  • Low risk: Simple bugfixes (missing files, updated documentation, typos) or changes in start or output scripts
  • Medium risk: Uncritical changes in the model core (e.g. moderate modifications in non-default realizations)
  • High risk: Critical changes in model core or default settings (e.g. changing a model default or adjusting a core mechanic in the model)

• Self-review own code

  • No hard coded numbers and cluster/country/region names.
  • The new code doesn't contain declared but unused parameters or variables.
  • magpie4 R library has been updated accordingly and backwards compatible where necessary.
  • scenario_config.csv has been updated accordingly (important if default.cfg has been updated)

• Document changes

  • Add changes to CHANGELOG.md
  • Where relevant, put In-code documentation comments
  • Properly address updates in interfaces in the module documentations
  • run goxygen::goxygen() and verify the modified code is properly documented

• Perform test runs

  • Low risk:
    • Run a compilation check via Rscript start.R --> "compilation check"
  • Medium risk:
    • Run test runs via Rscript start.R --> "test runs"
    • Check logs for errors/warnings
  • High risk:
    • Run test runs via Rscript start.R --> "test runs"
    • Check logs for errors/warnings
    • Default run from the PR target branch for comparison
    • Provide relevant comparison plots (land-use, emissions, food prices, land-use intensity,...)

📉 Performance changes 📈

• Current develop branch default : ** mins
• This PR's default : ** mins

🚨 Checklist for reviewer 🚨

• PR is labeled correctly
• Code changes look reasonable
  • No hard coded numbers and cluster/country/region names.
  • No unnecessary increase in module interfaces
  • model behavior/performance is satisfactory.
• Changes are properly documented
  • CHANGELOG is updated correctly
  • Updates in interfaces have been properly addressed in the module documentations
  • In-code documentation looks appropriate
• content review done (at least 1)
• RSE review done (at least 1)

[pfuehrlich-pik]

Suggested change

- **scripts** added start script which starts an empty model just regenerating a previous run

This is already in the changelog under 4.6.3

[pfuehrlich-pik]

Suggested change

	- **31_past** added additional limitation (single climate scenario input) for **grasslands_apr22**
	- **59_som** added new **cellpool_jan23** realization with updated 2019 IPCC guidelines values

This is already in the changelog under 4.6.3

[pfuehrlich-pik]

Unrelated to this PR, but why is the md5sum NA when the data comes from our public repo?

[tscheypidi]

idk

[flohump]

Thanks for adding this very useful feature!
The code looks fine to me.
However, there are changes in the model core.
Therefore, this qualifies as high risk PR (I changed this in the PR).
Please make test runs to check if the model results are unchanged.

[tscheypidi]

Our labeling policy is here a bit vague, but I would still see this PR as a low risk one as there are no "critical changes" in the code: My PR does not contain any changes which would affect the way things are being calculated in the model. All changes are pure technical nature and I tested that they only get active in instances where they should.

However, to be completely sure I also did now the set of test runs and as expected they are 1:1 identical to previous test runs.

[flohump]

I agree, our PR policy is a bit vague here.
Thanks for doing the test runs anyways.