CMakeLists now uses PETSc variables to configure everything + MUMPS lib is now taken from PETSc + MUMPS now uses MPI with SELF Communicator + Renaming Solver Matrix and Vector

git-svn-id: https://geuz.org/svn/gmsh/trunk@17130 59c8cabf-10d6-4a28-b43f-3936b85956c4


git-svn-id: https://geuz.org/svn/gmsh/trunk@17131 59c8cabf-10d6-4a28-b43f-3936b85956c4