OScope__SetupTimebase (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:oscope.h>
 *
 *    TOScope__Result OScope__SetupTimebase( const char *tLabel, TOScope__Data tStart,
 *                                           TOScope__Data tSample )
 *
 *  Function intent:
 *    OScope__SetupTimebase() provides a mechanism for setting the horizontal
 *    axis, or timebase, range and displayed X axis title.  If OScope__SetupTimebase()
 *    is called with a tLabel parameter of NULL the default lable string of
 *    "Time (S)" will be used.
 *  Function parameters:
 *    char              *tLabel         label to be displayed on the time axis
 *    TOScope__Data  tStart          trace start time - seconds
 *    TOScope__Data  tSample         trace sample step size - seconds
 *  Function return value:
 *    CBS_OK            success
 *    ~CBS_OK           OScope__DisplayScreen() already called