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Fix issues with the actual spm in order to make it works in distributed

Mathieu Faverge requested to merge faverge/spm:disp/spm_bases into master

This PR fixes minor issues that were not impacting the library in the shared memory case, but that would have a large impact on the distributed case.

  • Add a spmInitDist() function to initialize an spm with a specific communicator (MPI_COMM_WORLD by default)
  • Add a function to compute the glob2loc array when needed.
Edited by Mathieu Faverge

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