GitLab

don't issue error if mesh of invisible region contains no elements while Mesh.MeshOnlyVisible is set (fixes #532)

Return helpful error (instead of crashing) when trying to apply Laplace smoother to high-order meshes (fixes #533)

Fix some miscellaneous typos in API docs.

See merge request !256

make sure to initialize the 4th entry in MVertex* vector, so that the hash value is deterministic for triangular faces