Provide a standard window for displaying application information.

Classes
		gtk.Dialog(gtk.Window) InfoWin   class InfoWin(gtk.Dialog)       Window to show app info     Methods defined here: __init__(self, program, purpose, version, author, website)

Functions
		infowin(pname, info=None) Open info window for this program.  info is a source of the AppInfo.xml file, if None then $APP_DIR/AppInfo.xml is loaded instead