upgrade to mapdb-0.9.8.jar

Signed-off-by: Christian MICHON <christian.michon@gmail.com>
fixes needed due to MapDB api changes to keep reasonable performance

Signed-off-by: Christian MICHON <christian.michon@gmail.com>
release 1.2.0 (aligned with mapdb-0.9.8)

Signed-off-by: Christian MICHON <christian.michon@gmail.com>