Christophe Geuzaine authored
new mesh::clear() Rationale: setNodes/setElements were intrinsically a bad design choice, as these functions had to delete nodes and/or elements before storing the new ones. Using these functions in the wrong way could lead to an invalid mesh, with elements pointing to nodes that were deleted (in an adjacent entity). The only viable workflow is to delete the mesh (with the new clear() function), before adding nodes/elements.af8b0067
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