Allow for seeding a resource config.
Return a copy of the dict and not the dict itself.
(Free head banging on the table included with this commit)
Merge branch 'devel' into feature/mpi
Follow new resource config style.
New style resource config for das4.
Adapt to new resource config and try to override a value (doesn't work though).
Working MPI example for DAS4.
Use openmpi as PE, doesn't seem to hurt in non-mpi executions.
Further work on MPI support.

- For SGE, get core count from nodefile and not from counting the cores (this
  is a mismatch on DAS4.
- mpirun launcher implemented, verified on DAS4.
- catch non-existing arguments.