Switch to latest core (fixes PlTableEditor)

Signed-off-by: Raphaël Barrois <raphael.barrois@polytechnique.org>

diff --git a/core b/core
index ac6f41a..b2eec29 160000 (submodule)
--- a/core
+++ b/core
@@ -1 +1 @@
-Subproject commit ac6f41acd95a154ff0893f5e239760e026eb9d2a
+Subproject commit b2eec295f4a018ae416566007ff9bda64a5f5734