compute local Gramian matrix

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add framework to synchronize mothers

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
Surveyor: make space for flushing vertices

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