Higher-order brick-tetrahedron hybrid method for Maxwell's equations in time domain

- New hybrid FEM-interface between tetrahedrons and bricks for Maxwell's equations.
- Nitsche's method is applied to higher-order curl-conforming basis functions.
- Allows for both incomplete- and complete-order basis functions on tetrahedrons.
- Stable hybrid explicit-implicit time-stepping scheme.
- Computational results up to fourth-order curl-conforming basis functions.