Inhomogenous and anisotropic materials with Maxwell seems OK.
Validated by looking and cavity mode with smallfem and getdp.
Seems ok for {cube, square} with {Nedelec, complete order 1, complete order 2}.
Eigenvalues computed with Octave 'eig()'.


git-svn-id: https://geuz.org/svn/gmsh/trunk@18574 59c8cabf-10d6-4a28-b43f-3936b85956c4