/*!
* @fn sumOfPairsScore
*
* @headerfile <seqan/graph_msa.h>
*
* @brief Given a multiple alignment, this function calculates the sum-of-pairs
* score.
*
* @signature TScoreValue sumOfPairsScore(graph, scoringScheme);
*
* @param[in] graph An @link AlignmentGraph @endlink to use for the evaluation.
* @param[in] ScoringScheme The @link Score @endlink to use.
*
* @return TScoreValue The SOP score of the MSA (Metafunction: @link Score#Value
* @endlink of the type of <tt>scoringScheme</tt>).
*
* This function does NOT assume independent columns. That is, gap openings are
* properly scored. If you want the fast version assuming independ columns use
* sumOfPairsScoreInd.
*/