BlockIteration Generator

[JensHahne]

Hi @tlunet,

it took me some time, but i finally was able to build a block iteration generator for (arbitrary) multilevel settings. I checked it for two and three levels with only presmoothing, it fits from my point of view. Also other cases with e.g. post smoothing or four level make structural sense to me.

It would still be good if you could look over it again. At the moment everything is in the blockIterationGenerator.py file. One simply enters the number of levels, the number of pre- and post-smoothings, and n (this could be removed, right now you need higher n's when considering block iterations, which goes back to n-3 or so)

Either we leave the part and have to copy the blockform, or you get a coupling of it with the existing parts for the block iter. I am still unsure what is better