HessianMatrix implemented fully, but not yet working, probably due to wrong matrix generation in script file (convertHessian.py)
HessianMatrix::IsSymmetric was though to be needed, but is NOT. As we regard full matrices, we don't need to add onto mirrored indices as well
Joiner and Analyzer have seen some small changes and bugfixes: NoHessian was not also always looked at when needed and so on