Create "Sample mode" (or similar) to speed up rendering in PanelWizard

The PanelWizard can take some time to load because it is actually making queries to render the mini-view of each panel on the page.

To avoid having each panel test the current page (e.g. #if($doc.name == "PanelWizard") ), a new field could/should be added to the Panel object that would provide a "sample" view – i.e. an accurate rendering of the panel using sample/pretend data.

This should greatly speed up the loading of the page, as it would eliminate the multiple queries to the DB for each mini-panel view.