Working:
- Driver block
- Solving and visualization

Not working:
- Error calculation

These methods are part of the driver block class interface and should also be
generated if they are not used from the main function.

This options enables to generate jacobian apply methods regardless
of the `matrix_free` option. If `matrix_free` is set to true,
`generate_jacobian_apply` is also set to true. This option replaces
`matrix_free` in all contexts except in the selection of the solver.

Instationary stuff not fixed so far.

It has single precision support...

Otherwise debugging of nonlinear problems becomes hard.

Do not annotate FiniteElements anymore, further split driver code

Do not annotate FiniteElements anymore, further split driver code