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Fix various bugs related to detrending and prefiltering

  • dyn_forecast adds unlogged steady state if loglinear is used
  • dynare_estimation_init sets the noconstant based on the unlogged steady state if loglinear is used
  • when trends are specified as a function of deep parameters, the values are not correctly updated during estimation due to using the base-workspace parameter values and not the updated local ones
  • when using trends with the prefilter option, the mean shift due to the trend is not accounted for
  • when using first_obs>1, the higher trend starting point is not taken into account (leads also to problems in recursive forecasting)