Add test for mp_insert with value lists. Refs #53.

test/Jamfile

@@ -133,6 +133,7 @@ run mp_replace_at.cpp ;
 run mp_replace_at_c.cpp ;
 run mp_for_each.cpp ;
 run mp_insert.cpp ;
+run mp_insert_2.cpp ;
 run mp_erase.cpp ;
 run mp_erase_2.cpp ;
 run mp_with_index.cpp ;