Restart functionality for complete simulations

[shahmoradi]

Discussed in #32

For details, see the discussion by @Peku995 in the above link.

^{Originally posted by Peku995 August 3, 2023}
I have an idea for the upcoming release: At the moment, it is not possible to use a completely finished simulation as a starting point to carry out further iterations from here (at least to my knowledge). At the moment, this is only possible for simulations that are not completely finished. I think it would improve the restart capabilities of Paramonte considerably if you could also start from simulations that have already ended and then simply save the whole thing under a different name.