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[WIP] Enable PETSc + MUMPS

Kilian Lackhove requested to merge feature/PETSc_MUMPS into master

This MR changes PETSC to build its own MUMPS library:

  • It works for me
  • MUMPS requires a Fortran compiler and in order to make MPI pick up the Fortran specific libraries, i had to add that language to Nektar++
  • Now PETSc compiles its own MUMPS, scalapack and scotch
  • Building PETSc with metis did not work because that will conflict with our modmetis library
  • Pointing PETSc to Nektars scotch install was not successful and i have no idea what happens when Nektar++ and PETSc both use their own versions

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