Introduces a mf_integrate_2 function
Description
Introduces a mf_integrate_2 function
Also cleans the call to mesh%allreduce that was unnecessarily fenced by a check of parallel in domain
This also fixes a bug of a missing reduction for one output.
News snippet
Code refactoring.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.