[DynareDev] [Trac] #54: Add hp_filter

#54: Add hp_filter --------------------------+------------------------------------------------- Reporter: stepan | Owner: stepan Type: feature | Status: new Priority: major | Milestone: 4.1 Component: Core M-files | Version: Keywords: | --------------------------+------------------------------------------------- Only theoretical hp filterd moments are available in the current version. We need to add a general function for hp filtering time series and call this new function when displaying simulated moements (with option hp filter).