convergence output can have 0 or even negative values

[Datseris]

After my updates to the convergence output in

fractions, labels, convergence = convergence_and_basins_fractions(mapper, ics; show_progress = false)

I've noticed that simulation results can have 0 or even negative convergence for the recurrences mapper.

Clearly, this is because of errors in the new logic I've implemented that adjusts convergence counts given the state of the finite state machine. I need to fix this, and I need to implement a robust test case for it as well to ensure it is working properly...