By Caldwell Titcomb Jan. 6,7,8,9,12: The Boston Symphony is led by Ton Koopman (b. 1944), Dutch keyboardist, conductor, and specialist in early music, knighted in 2003 in the Netherlands. With a bow to Haydn, the bicentennial of whose death occurred in 2009, there are two works: Symphony No. 98 in B-flat Major (1792), and Cello…