Change default load function to not guess at file type
Change default load function to not guess at file type

- now that Ginga can ask the user what opener to use, don't guess
  at the file type

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