v1.7.1

• Updated the Mesh.Nodes_* methods.
• Removed the groupElem.assembly_e property.
• Added a SwapOrientation option for the crack plugin.
• Clarified the groupElem._Get_sysCoord_e method.
• Created the PyVista.Plot_Arrows function.
• Updated surface normals for 3D elements:
  • Ensured consistent coordinate usage across element groups.
  • Utilized all coordinates in the MeshIO.Surface_reconstruction function.
  • Guaranteed outward-facing normals for all mesh faces in groupElem._Get_sysCoord_e.
• Updated Sphinx documentation:
  • Updated docs/html_theme_options.
  • Reset Geoms instance numbering and ensured BUILDING_GALLERY is set to False during gallery construction.
  • Updated LaTeX options in the documentation.
  • Removed \begin{alignat} from .. math:: environments.
• Updated optional dependencies:
  • Marked meshio as an optional dependency.
  • Marked imageio as an optional dependency.
  • Added io to optional dependencies.
  • Added viz to optional dependencies.
  • Updated optional dependencies in .github/workflows/tests.yaml.
  • Marked matplotlib and pyvista as optional dependencies.