storage of kstep ahead filter covariance and variables
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store oo_.FilteredVariablesKStepAheadVariances only if options_.filter_covariance. this can save a lot of memory for large models
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oo_.FilteredVariables must be stored independently to a previous MCMC. evaluate_smoother must in any case provide full info in oo_
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in prior_posterior_statistics options_.filtered_vars does not always imply filtered variables are computed. options_.nk is more robust.