Execute query to read a single value

Include by one of:

    $this->execPieceByName('ff_InitUtilities');
    $this->execPieceByName('ff_SubmitUtilities');
    if (!function_exists('ff_selectValue')) $this->execPieceByName('ff_selectValue');

Call syntax:

    $value = ff_selectValue($sql);

    $sql:    Sql SELECT-statement to call
    $value:  The value returned by the database