/* $DOC$
   $NAME$
      ft_ASum()
   $CATEGORY$
      Array
   $ONELINER$
      Sum the elements of an array
   $SYNTAX$
      ft_ASum( <aArray> [, <nStartIndex> [, <nEndIndex> ] ] ) -> nSum
   $ARGUMENTS$
      <aArray> is the array containing the elements to be summed.

      <nStartIndex> is the first array item to include,
      defaults to first element.

      <nEndIndex> is the last array element to include,
      defaults to all elements.
   $RETURNS$
      The sum of the elements of the array or the lengths of the elements.
   $DESCRIPTION$
      This function is to sum the elements of a numeric array or to sum the
      lengths of a character array.
   $EXAMPLES$
      ? ft_ASum( aSubTotals )               // Sum the Entire Array
      ? ft_ASum( aSubTotals, 5 )            // Sum from the 5th Element On
      ? ft_ASum( aSubTotals, , 10 )         // Sum the 1st 10 Elements
      ? ft_ASum( aSubTotals, 5, 10 )        // Sum Elements 5-10
   $END$
 */