Haroche cavity with small_fem: almost good !make
Find same eigenvalues as getdp for coarse mesh (full order 1) BUT CONJUGATED...
Not super cool, but not bad \o/
Eigenvectors looks right !

Enhanced SystemEigen (spectral transform + MUMPS + shift)


git-svn-id: https://geuz.org/svn/gmsh/trunk@18607 59c8cabf-10d6-4a28-b43f-3936b85956c4