Using SystemAbstract::addFormulation to assemble a formulation
  ** Need to clean SystemAbstract::getSolution(FEMSolution)
      ++ No automatic choice of right domain
  ** Need to clean SystemEigen for (non) general problem
      ++ Better way is to add an interface 'addFormulationB()'
  ** Need to test for DDM

Except those three points it works :-) !



git-svn-id: https://geuz.org/svn/gmsh/trunk@17594 59c8cabf-10d6-4a28-b43f-3936b85956c4