Print an error if non-positive dt is detected #192
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Print an error if non-positive dt is detected for the usual constructors of any of the integrators. There might be some internal use cases for negative dt; this can be achieved with a mutable update:
Also deprecate the
Base.copy(dyn::Langevin)overload. For user code, the same can be achieved withdeepcopy(dyn). It's not clear we want to recommend that to users, though. See #193 for discussion.