Remove `part_vec`
Description
The variable part_vec contained a global mapping of points to partitions. It is now only needed in a single occasion (for MeshUseTopology = yes), where it is computed locally.
This removes one global variable and thus decreases memory usage for large meshes.
The output for the mesh partition had to be adapted.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.
Edited by Sebastian Ohlmann