add a tolerance argument to set_state_inspector()

[mcol]

It would be nice to be able to control the tolerance when using set_state_inspector() to avoid diffs like this:

Global state has changed:
`before$par$mai`: 1.01999999999999980 0.81999999999999984 0.81999999999999973 0.41999999999999998
 `after$par$mai`: 1.02000000000000002 0.81999999999999984 0.82000000000000006 0.41999999999999998