Variables renamed

delta__L1->delta_L1
delta__L2->delta_L2
Adding a TODO item
Variables renamed

The LHS of the ode system start now with dot_
Some comments & change in eq_all_param

in eq_all_param() -> on each call the corresponding zone will be deleted first and then newly generated
Testing eq_all_params for the all three zones
in sens_ext_sys() the self was missing
testing sens_ext_sys() - not working for now, fix possible