Interpolation for h-refined meshes

[stefanhenneking]

Implement option to interpolate existing solution DOFs on the h-refined mesh.

New modules:

• module refinements_geometry
• module refinements_history

Logic of nodal dof interpolation in h-refinement:

• The break routine first saves nodal dofs before breaking a node, using the save_element routine provided by module refinements_history
• After breaking a node, the break routine then initiates the new nodals dofs using the initiate_dofs routine which uses module refinements_geometry