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 qfill                                                                 QWIKC
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 Function       Fills the screen with a character with an optional attribute
                change in a rows-by-columns block on the current screen.
 Syntax         void qfill( unsigned char row, unsigned char col,
                            unsigned char rows, unsigned char cols,
                            int attr, unsigned char ch );
 Remarks        The upper left corner of the block starts at (row,col) and
                the block size is rows by cols.  If SAMEATTR is used for
                attr, then the attribute will remain the same on the screen.
                If rows or cols is zero, then nothing is written.
 Return value   None.
 Screens        All video pages and virtual screens.
 EOS            Updated.
 Restrictions   Stay within the screen limits.
 Example        To clear the screen with black on brown attribute:

                  qfill( 1, 1, crt_rows, crt_cols, BLACK+BROWN_BG, ' ' );