Update core

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

diff --git a/core b/core
index 277bb52..23947d1 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit 277bb52765efb79e31092f5555a750146d379987
+Subproject commit 23947d18803b48cc6c235cdd3c304ca52fd6763c