OScope__DisplayScreen (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:oscope.h>
 *
 *    TOScope__Result OScope__DisplayScreen( char *displayTitle,
 *                                                 int displayYAxisNumeric )
 *
 *  Function intent:
 *    OScope__DisplayScreen() creates the oscilloscope display with the
 *    requested features and displays it on the graphic display device.
 *    OScope__DisplayScreen() should be called after any calls to:
 *                           OScope__Initialize()
 *                           OScope__SetupTimebase()
 *                           OScope__SetupChannel()
 *                           OScope__EnableAnnotation()
 *                           OScope__EnableCoordinates().
 *
 *  Function parameters:
 *    char    *displayTitle         pointer title\subtitle string
 *    int     displayYAxisNumeric   TRUE display Y axis numeric lables
 *  Function return value:
 *    CBS_OK    success
 *    ~CBS_OK   OScope__DisplayScreen() already called
 *    else      wn_xxx() function error occured