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remove MPI comm from DFTB+ init

Martin Lueders requested to merge DFTBp_serial_only into main

Description

Newer versions of DFTB+ stop with an error if an MPI communicator is passed to the constructor of a serial DFTB+. We now removed that communicator as we only use the serial version of DFTB+.

News snippet

Fix MPI communicator error of DFTB+ (versions > 22.1)

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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