WIP: Minor fixes related to the use of batches.
Description
Minor fixes related to the use of batches. This reduces a bit the number of calls to pack/unpack for RMMDIIS calls.
News snippet
Minor fixes related to the use of batches.
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.
Edited by Nicolas Tancogne-Dejean