Cleaning + Correcting Doc + Laplace is now a particular case of Poisson + Reworking how Options works: more flexible

git-svn-id: https://geuz.org/svn/gmsh/trunk@17258 59c8cabf-10d6-4a28-b43f-3936b85956c4
useless files



git-svn-id: https://geuz.org/svn/gmsh/trunk@17259 59c8cabf-10d6-4a28-b43f-3936b85956c4