Integrate the Kalman tracker into Fiji.

Fixes #9.
Needs JUnit tests, and concrete application tests.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
Another simple interactive test for the Kalman tracker.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>