Improving (Python) API

API changes

• [C++] [Python] Several functions now return a pointer to internal data rather than a copy.
  In the Python-API this changes these functions (e.g. .foo()) to properties (e.g. .foo).

• [MeshQuad4.h] Renaming:

  • getCoarseMesh() to coarseMesh()
  • getFineMesh() to fineMesh()
  • getRegularMesh() to regularMesh()
  • getFineLayerMesh() to fineLayerMesh()
  • getMap() to map()
  • getMapFraction() to mapFraction()
    (immediate removal in Python, as there are any changes; functions marked as deprecated in C++).

• [Iterate.h] Renaming:

  • .get() to .data()
    (immediate removal in Python, as there are any changes; functions marked as deprecated in C++).

• [Mesh.h] Renaming:

  • .getElementType() to .elementType()
    (immediate removal in Python, as there are any changes; functions marked as deprecated in C++).

• [Matrix*.h] Adding pointers to .data*().
  This deprecates Todiagonal
  (immediate removal in Python, as there are any changes; functions marked as deprecated in C++).

• [Matrix*.h] Adding allocation free API to Python API.

Other changes

• Integrating implementation and headers for maintainability.
  The user is expected to get an overview from the doxygen docs.

• Using CRTP for Matrix*.

Future work

• Working around xtensor bug and outdated GMat modules, see be7f823