The final concert of the 2013–14 Masterworks season bore the theme “Love Around the World,” for reasons best known only to those who chose the theme, since the scope of the music performed was limited to Mexico and Spain, with a touch of ancient Persia and Russia thrown in. But that is quibbling, since many members of Saturday’s large audience headed home with smiles and the clear impression that the season’s best effort had been saved for last.