lxhlin(row.i4.r, column.i4.r, num_chars.i4.r, color.i4.r)

	lxhlin_c(row.i4.v, column.i4.v, num_chars.i4.v, color.i4.v)

	This routine draws a horizontal line on the current graphics screen
	starting at "row", "column" and having a length of "num_chars"

	row		row of line
	column		column of left end of line
	num_chars	length of line in characters
	color		color of line (constants are in cnsparam)

	This function requires the following include files:

	cnsparam_h, cbslib_h

	Related functions:

	lxvlin(_c), lxbox(_c), wn_vector(_c), lx_row_to_pix(_c),
	lx_col_to_pix(_c), read_lx_format