Fix for Overlays plugin to unreference large arrays when stopped
Fix for Overlays plugin to unreference large arrays when stopped

naojsoft/ginga,stscieisenhamer/ginga,pllim/ginga,stscieisenhamer/ginga,naojsoft/ginga,ejeschke/ginga,stscieisenhamer/ginga,ejeschke/ginga,naojsoft/ginga,pllim/ginga,ejeschke/ginga,pllim/ginga