OScope__Delete (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:oscope.h>
 *
 *    TOScope__Result OScope__Delete( void )
 *
 *  Function intent:
 *    OScope__Delete() erases the graphic oscilloscope display and deletes
 *    any OScope allocated data structures.  OScope__DisplayScreen() must have
 *    been called prior to OScope__Delete().
 *  Function parameters:
 *    none
 *  Function return value:
 *    CBS_OK            success
 *    ~CBS_OK           OScope__DisplayScreen() not yet called
 *    else              wn_xxx() function error status