Teach the pre-processing DoG to do proper background subtraction

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add example macro to extract 'kymograph' from TrackScheme

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Exclude batik from the tests

Batik interferes with sane XML processing... :-(

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Add an ImageJ 1.x plugin to visualize tracks

This plugin takes an .xml file -- exported from TrackMate -- the
path to the movie and the path to the pre-processed movie that was
actually processed by TrackMate, and generates a kymograph.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>