Test also with setGroupFiles( false )

This requires the ImgLib from the 'performance' branch to work right now.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Run a test more along the lines of Tobias' original one

In preparation for the email.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Turn off profiling for now

... to get realistic timing.

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