Improved distribution of GPUs when running the testsuite
Description
Improved distribution of GPUs when running the testsuite by keeping track of GPUS in use. Also fixed the case when running with MPI+GPUs, as the script was using the availability of a working mpiexec to decided if how to distribute the GPUs, instead of checking if the code had been compiled with MPI.
News snippet
Improved distribution of GPUs when running the testsuite.
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.