algo: Add CBM_PARALLEL_FOR macro.

Hide omp parallel for-pragma behind macro for better readability.

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Dear @f.uhlig, @v.friese, @p.-a.loizeau,

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.

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Go ahead. Needs local rebase.

added 2 commits

• 6f36b307 - 1 commit from branch computing:master
• a054c167 - algo: Add CBM_PARALLEL_FOR macro.

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Fixed merge conflicts. Merging now.

enabled an automatic merge when the pipeline for a054c167 succeeds

@f.uhlig: Some tests failing due to full disks: https://cdash.gsi.de/testDetails.php?test=16353798&build=411544

I will have a look, it seems to be run4 which is in fact one of the nodes which should have many hard drives. Probably a rogue process filled it with logs

merged

I freed some 40 GB space, there were a few 6-10 GB build folders from Cbmroot user pipelines of September 2022 in the home folder of the gitlab-runner. Still not sure what led to the problem appearing right now, maybe the current pipeline needs a bit more space than in old time (the node had 12-15 GB free in its home partition)