fix writeVolumeMeshPoints

[mtowara]

moved to pyOFM, fixes #80

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [ ] Maintenance update
• [ ] Other (please describe)

Checklist

• [ ] I have run flake8 and black to make sure the Python code adheres to PEP-8 and is consistently formatted
• [ ] I have formatted the Fortran code with fprettify or C/C++ code with clang-format as applicable
• [ ] I have run unit and regression tests which pass locally with my changes
• [ ] I have added new tests that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[codecov[bot]]

Codecov Report

Merging #84 (57e2e40) into main (ebcb939) will decrease coverage by 0.20%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
- Coverage   73.50%   73.31%   -0.20%     
==========================================
  Files           6        6              
  Lines         755      757       +2     
==========================================
  Hits          555      555              
- Misses        200      202       +2     

Files Changed	Coverage Δ
idwarp/UnstructuredMesh.py	62.44% <0.00%> (-0.30%)	:arrow_down:

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[friedenhe]

@bernardopacini The new change looks good to me.