Fix state initialization of LFibs and MRGs

[schmouk]

It appears that very first initialization of LFibs and MRGs is not fully correct. Let's fix this according to the content of this chapter : L’Ecuyer, P., Panneton, F. (2009). F2-Linear Random Number Generators. In: Alexopoulos, C., Goldsman, D., Wilson, J. (eds) Advancing the Frontiers of Simulation. International Series in Operations Research & Management Science, vol 133. Springer, Boston, MA. https://doi.org/10.1007/b110059_9