Remove useless and faulty interactive test.

Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>
LoGDetector is now properly multithreaded.

We depended on the beta-23 of imglib2 to be released: FFTConvolution is
then multithreaded in a proper way. Before this, FFTConvolution was
using all threads, even when asked not to.
Signed-off-by: Jean-Yves Tinevez <jean-yves.tinevez@pasteur.fr>