petsc array and matrix conversion

[nico-canta]

• The test I introduced uses the package "pytest-mpi" and is automatically skipped in the CI. Do we keep it? Or remove it? Do we include it in the CI? Shall I add more tests for functions that use mpi?

• In Scatterv, I wanted to use MPIU_REAL instead of MPI.DOUBLE, but I couldn't find it from the python bindings. Since we compile with "--with-scalar-type=real", is MPI.Double ok? Or better to make it more flexible?

Open to hearing other comments and suggestions.

[nico-canta]

The functions array2distArray and coomatrix2PETScMat_naive are not used. Do we still need them?

[nico-canta]

https://github.com/BlueBrain/AstroVascPy/blob/b7e501f6ba9dfb674e12186cbc00576c69c68575/astrovascpy/bloodflow.py#L432

I think we can use the function array2PETScVec here as well. I can add the possibility of converting integer arrays. Is it ok?

[kotsaloscv]

https://github.com/BlueBrain/AstroVascPy/blob/b7e501f6ba9dfb674e12186cbc00576c69c68575/astrovascpy/bloodflow.py#L432

I think we can use the function array2PETScVec here as well. I can add the possibility of converting integer arrays. Is it ok?

I had issues with array2PETScVec and integer arrays. While for small arrays it was working ok, with the very large full mouse brain circuit, it was failing. I would leave it as is.

[kotsaloscv]

The functions array2distArray and coomatrix2PETScMat_naive are not used. Do we still need them?

I would leave them for completeness and future reference.

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