Implemented KalmanTrackerFF for fast flows

[Lollum89]

I had some difficulties to track spots that were moving a significant amount between frames. I enhanced the Kalman Tracker to be able to track fast particles with a prevalent direction.
This is done in the pull request #296 (which substitutes #295), by specifying an expected displacement for the initial search.

[tinevez]

Hello @Lollum89
I am sorry for the long delay in answering you.

Would you be able to refactor your contribution as a an external module (a TrackMate extension), like https://github.com/trackmate-sc/TrackMate-Weka ?

I would favor this rather than including it in the core artifact.