Speed up testsuite

tests/estimation/univariate/bayesian.mod

tests/estimation/univariate/bayesian_param_names.mod

...refiltering/MCMC/Trend_loglin_no_prefilt_first_obs_MC.mod

...d_prefiltering/MCMC/Trend_loglin_prefilt_first_obs_MC.mod

...and_prefiltering/MCMC/Trend_loglinear_no_prefilter_MC.mod

...ds_and_prefiltering/MCMC/Trend_loglinear_prefilter_MC.mod

...on_trends_and_prefiltering/MCMC/Trend_no_prefilter_MC.mod

...and_prefiltering/MCMC/Trend_no_prefilter_first_obs_MC.mod

...ation_trends_and_prefiltering/MCMC/Trend_prefilter_MC.mod

...ds_and_prefiltering/MCMC/Trend_prefilter_first_obs_MC.mod

tests/particle/dsge_base2.mod