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## What is the new feature
This MR makes sure that the new version with OpenACC feature can be properly merged back to `icon-mpim`
## How is it implemented
See MR in icon-mpim for BuildBot results. All BuildBots must pass.
- Doxygen-style comments are removed to following the ICON style guide
- Intent specifiers are manually capitalized. This is an open issue for `fprettify`. See [here](https://github.com/pseewald/fprettify/issues/108

)
- [x] Put back missing subroutines

## Mandatory steps before review
- [x] Gitlab CI passes _(Hint: use `make format` for linting)_ 
- [x] New feature is covered by additional unit tests
- [x] Mark the merge request as ready by removing `Draft:`

## Mandatory steps before merge
- [x] Test coverage does not decrease
- [x] Reviewed by a maintainer
- [x] Incorporate review suggestions
- [ ] Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)

**You are not supposed to merge this request by yourself, the maintainers of fortan-support take care of this action!**

Approved-by: Jonas Jucker <jonas.jucker@env.ethz.ch>
Merged-by: Yen-Chen Chen <yen-chen.chen@kit.edu>
Changelog: feature