Update core

Signed-off-by: Florent Bruneau <florent.bruneau@polytechnique.org>

diff --git a/core b/core
index 2a683f7..4314727 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 2a683f7ff213da0d2a2fdd26f88b2025394c91d6
+Subproject commit 4314727805eedd77202a6addef0d3ad4b666f678