Mdal-python

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- fix debug message error (15)
- Deprecate mdal-python (16)

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- fix memory leaks and inconsistencies around the Datagroup object (11)

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- Add the PyPI package

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First Read / Write Release

- read and write all MDAL compatible file formats
- access vertex, face, edge and volume data as numpy arrays
- write vertex, face, edge and volume data from numpy arrays
- access and write scalar and vector datasets
- beta level read and write integration with meshio
- beta level read integration with Open3D

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First release. This is beta software and has not been completely tested yet:

Currently, this integration can:

- read all MDAL compatible file formats,
- access the metadata for the source,
- access the vertex, face and edge data as numpy arrays,
- access 'double' datasets (both scalar and vector) as numpy arrays, and
- convert the MDAL source mesh into a `meshio`_ mesh object (with some restrictions currently).

This version does not currently allow the MDAL source mesh to be written or ammended.