Move SimulationOptions all the way down to blocks

This probably isnt the best design, as some options are set _after_
DAE creation, but this is the best I can make up on a short train ride.

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Set maximum iterations in options

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Add convergence error test

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Add iteration start values to options

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>
Correct toString() method

Signed-off-by: Christoph Höger <christoph.hoeger@tu-berlin.de>