Pickleable models - #26
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Component.__getstate__/__setstate__ replaces the package module with its dotted name; Model and Par __getstate__ null parent back-refs and transient fit state to keep pickles bounded to a single Model (~6x smaller) and avoid cyclic self-refs. Enables copy.deepcopy(model), fixes latent lmfit.emcee(workers>1) silent pickle error, and unblocks the planned slice-by-slice ProcessPoolExecutor dispatch.
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necessary to enable parallelizing slice-by-slice fits and enabling MCMC with workers>1