🚀 go-pugleaf

M. Stote and D. Mattern have advised me to check if the problem is due to "Self-tuning".  It seems
that this is not the case here. Since my friend has found the same problem in simulation of a
  plant  with smooth nonlinearity in open loop. However, it is a good point to switch integration
algorithms. I've tried several algorithms that but did not went through Euler. the problem with Euler is for
larger steps it goes unsteady and for small one it is extremly slow. I will be patient next time. :-)