Added improved sampling example to nmmcsolve notebook

[pmenczel]

Added a small example for the improved sampling option to the nm_mcsolve notebook. This option was disabled for nm_mcsolve until PR 2369.

The advantage of the improved sampling is not super apparent here tbh, since the frequency of no-jump trajectories are low in the examples here. (But creating a completely new example just for this would be a bit much.)

[Ericgig]

I looked at the graph produced and there is a visible difference between improved sampling or not and no trajectories without collapse.
Is that just bad luck?

[pmenczel]

Yes unfortunately, the difference between improved sampling or not is not really visible because of too much randomness. In the output of the Counter, one can see that with the improved sampling, only one trajectory with zero jumps is generated.

The difference should be more visible in an example where most of the trajectories have no jumps (here, it is only 10%). I will try to play a bit more with the parameters if I can find such an example.