Additional single-precision related changes

What is the bug

This MR:

• Reverts all variables in set_zlev() back from double-precision to working-precision.
• Adds a single & double precision variants (previously working-precision) of rotate_latlon()

Details

Reverting set_zlev() changes I introduced in !13 (merged). This will only effect single-precision builds.

How urgent is the bugfix

• I need it as soon as possible
• I can wait for a couple of days
• None of my current codes is directly affected

Mandatory steps before review

• Gitlab CI passes (Hint: use make format for linting)
• Bugfix is covered by additional unit tests
• Mark the merge request as ready by removing Draft:

Mandatory steps before merge

• Reviewed by a maintainer
• Incorporate review suggestions
• Remember to edit the commit message and select the proper changelog category (feature/bugfix/other)
• Prior to merging, please remove any boilerplate from the MR description, retaining only the What is the bug and How do you fix it section to maintain

You are not supposed to merge this request by yourself, the maintainers of libiconmath take care of this action!

added bug label

assigned to @k202204

marked the checklist item Gitlab CI passes (Hint: use make format for linting) as completed

marked the checklist item Bugfix is covered by additional unit tests as completed

marked the checklist item Mark the merge request as ready by removing Draft: as completed

added 6 commits

• 272530d5...f0d63c2e - 5 commits from branch main
• 6ea006db - revert set_zlev back to wp

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added 1 commit

• 5f794134 - sp/dp interface for rotate_latlon

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changed title from Draft: Revert set_zlev() changes to Draft: Additional single-precision related changes

changed the description

requested review from @k202170

added 1 commit

• 0563fd69 - tried to fix a bug related to typos

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added 1 commit

• 055f304b - tried to fix a bug related to typos

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added 1 commit

• 7766d8b5 - tried to fix a bug related to typos

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added 1 commit

• 2faa335d - tried to fix a bug related to typos

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marked this merge request as ready

marked the checklist item Reviewed by a maintainer as completed

marked the checklist item Remember to edit the commit message and select the proper changelog category (feature/bugfix/other) as completed

marked the checklist item Prior to merging, please remove any boilerplate from the MR description, retaining only the What is the bug and How do you fix it section to maintain as completed

merged

mentioned in commit 11f6c57a