Post porcessing routines for distributed data: create_femfields and eval_femfields + example_pproc (still without Psydac post process manager)
- Added -a profile option: profiles all called functions, no names specified.
- Added Kronecker matrices to preconditioner, improved the test thereof.
- Added new base class for 1d dispersion relations; tested with maxwell 1d.
- Added a function to perform fft in space-time, (t, x) -> (omega, k), where x can be a logical or physical coordinate.
- Added Femfields to the initialization of the FE variables.
- Fixed maxwell_psydac: update_ghost regions was missing.