Little modification into the code

Signed-off-by: Jean-François Erdelyi <jferdelyi@gmail.com>
Little modification into the code

Signed-off-by: Jean-François Erdelyi <jferdelyi@gmail.com>
add a test that populates a big quadtree

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>