int hits(int column) {
        if (column < left) {
            return -1;
        } if (column >= right) {
            return 1;
        } else {
            return 0;
        }
    }
Hit testing.
@param column column index
@return -1 if the column is to the left of this range, 
0 if the column is in this range and 
1 if the column is to the right of this range
src/nu/validator/checker/table/ColumnRange.java