Add Augmented Electric Field Integral Equation Feature

[mx-nlte]

• Descretizing Maxwell allows for screens, i.e., normal components at the boundary are omitted
• Convergence of the A-EFIE method is shown with an academic example in unsupported/examples/AugmentedEFIE.cpp
• Low-frequency stability is demonstrated with the same example by considering the condition number and the point wise error in the computed E-field, see unsupported/examples/AugmentedEFIEStabilized.cpp.
• Feasibility of the spline-based A-EFIE method is shown by an application to an engineering problem. The design consists of a balun with an attached spiral antenna of significant curvature, see unsupported/examples/AugmentedEFIEBalun.cpp.

[jdoelz]

ok for me!