don't spawn Mother without -run-surveyor

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add some methods around the edge set

Signed-off-by: Sébastien Boisvert <sebastien.boisvert.3@ulaval.ca>
add code for StoreKeeper actors

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