Add_state, add_transition correspond only to the graph

[kpotomkin]

Currently there are methods: add_state, add_transition, which are correspond only to the graph of the automata, however we can end up with the graph which will have different number of locations and transitions in comparison with modes and resetmaps array.

Proposition: add methods for the HybridSystem, for adding and removing states(modes) and transitions(resetmaps)

[blegat]

add methods for the HybridSystem, for adding and removing states(modes) and transitions(resetmaps)

I agree, these method should also include the reset maps, ... for the added element