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=> faster computation of periodic boundary conditions.
+ Reorganize local_project.

Support the arguments nb_cells and offset.
Possibility of choosing the size of the triangles or (X-OR) the size of the unit cell.
Black formatting

Original commit for this change: 0b6c4d15

Improve structure of the code.
Better separation between the class definitions on one hand and the imports of the mesh and the subdomain data on the other hand.