OScope__ChanAnnotateText (ul_pbar_graphics)

 *  Synopsis:
 *    #include <ul_pbar_graphics:oscope.h>
 *
 *    TOScope__Result OScope__ChanAnnotateText( int channel, int row, int col,
 *                                              const char *text, int color )
 *
 *  Function intent:
 *    Write a text string to the specified channel window at a specified
 *    [row, col] in a specified color.
 *  Function parameters:
 *    int       channel         channel number
 *    int       row             row at which to display text
 *    int       col             column at which to display text
 *    char      *text           pointer to the text string to display
 *    int       color           color with which the text string is displayed
 *  Function return value:
 *    CBS_OK            success
 *    CBS_NOSETUP       OScope__DisplayScreen() not called
 *    CBS_RANGE         channel number out of range
 *    else              wn_xxx() function error occured