Do not kill or replace the ROI in the displayer.

Fix 203.
Anotther positive consequence is that the ROI can be modified in
detector config panel. This lets the user also ajust the ROI with
detection preview.

Author: tinevez

src/main/java/fiji/plugin/trackmate/visualization/hyperstack/HyperStackDisplayer.java

@@ -44,8 +44,6 @@ public class HyperStackDisplayer extends AbstractTrackMateModelView
 
 	private SpotEditTool editTool;
 
-	private Roi initialROI;
-
 	public static final String KEY = "HYPERSTACKDISPLAYER";
 
 	/*
@@ -151,10 +149,6 @@ public void centerViewOn( final Spot spot )
 	@Override
 	public void render()
 	{
-		initialROI = imp.getRoi();
-		if ( initialROI != null )
-			imp.killRoi();
-
 		clear();
 		imp.setOpenAsHyperStack( true );
 		if ( !imp.isVisible() )
@@ -183,10 +177,6 @@ public void clear()
 			imp.setOverlay( overlay );
 		}
 		overlay.clear();
-
-		if ( initialROI != null )
-			imp.getOverlay().add( initialROI );
-
 		refresh();
 	}