Remove 'pragma once' in cxx-file.

added Online WarnFix labels

assigned to @fweig

added 2 commits

• 6cd9d7f4 - 1 commit from branch computing:master
• bb2fb8db - Remove 'pragma once' in cxx-file.

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enabled an automatic merge when the pipeline for bb2fb8db succeeds

Dear @d.smith, @fweig,

you have been identified as code owner of at least one file which was changed with this merge request.

Please check the changes and approve them or request changes.

added CodeOwners label

merged