Work on this totaly bull shit navier stokes what ever I have never heard about solver, i will go home and eat one or two cakes.

Added framework for a PETSc based navier stokes solver. Still must, or Sebastian should do it, implement the specific algorithm.

Ups, mal ein code refactoring dass nicht gleich in 100 bugfixes enden. So, nun sollte der ganze parallele spass auch fuer gekoppelte Probleme ohne Tricks funktionieren. Nur testen will es mal wieder keiner, daher geh ich mittag essen.

Fixed for using petsc-dev, have to remove the petsc multigrid class which is far away from being usefull.

"DOFVector.hh:1845:7: error: ‘getLocalVector’ was not declared in this scope,
and no declarations were found by argument-dependent lookup at the point of
instantiation [-fpermissive]"