Bugfix in oct-wannier90
Description
Add a check to avoid infinite loops in case one tries to exclude a state with higher index than st%nst. Also, the code does not compute the external potential anymore when calling oct-wannier90, as this is not needed for the utility.
News snippet
A small fix and an improvement for oct-wannier90.
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.