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rescale_prediction_error_covariance

Marco Ratto requested to merge rattoma/dynare:rescale_prediction_error_covariance into master

rescale_prediction_error_covariance is an expensive option. However, if we trigger it only when F non-rescaled is detected as singular, it may filter out penalties in likelihood computations, which I think is a good thing. strictly speaking this is not a bug fix, but since this reduces the occurrence of errors in likelihood may be cherry-picked to 4.6: up to you.

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