Browser Application wrapper

- Click to start webbrowser (taken from $BROWSER, defaults to netscape)
- Choose alternate browsr from applicatioon menu
- drop HTML files to load them into the default browser
- drop files of type 'text/x-uri' to load the URLs contained in them
  into the default browser 
  (needs URL-Utils, see http://www.chriarndt.de/software/rox/)
- click with PRIMARY X selection to open url or file pointed to by the 
  selection into the default browser
