Updates to FBrowser plugin
Updates to FBrowser plugin

- remove save image option, similar and better functionality is
    available in SaveImage plugin
- consolidate buttons into one hbox
- add tool tips for buttons

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