Inner loops

[joachimwolff]

Inner loops run infinite time if their minCoeff does not get smaller than delta or maxCoeff greater than Delta.

https://github.com/deeptools/Knight-Ruiz-Matrix-balancing-algorithm/blob/master/src/krbalancing.cpp#L134

We need some mechanism to stop after a max number of iterations and or to check problematic matrices at initialization time.

In case the inner loop terminates, we should still return a value and not quit with exit(1) the depending software too. I need this especially in the context of single-cell Hi-C, the failure of one matrix should not influence the computation of the others by terminating the whole software.