From 7fa83e7374b38e9900e77cf2b29b54919f65d1ef Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Tue, 8 Jul 2014 09:56:09 +0200
Subject: [PATCH] Fix LDLT with semi-definite complex matrices: owing to
 round-off errors, the diagonal was not real. Also exploit the fact that the
 diagonal is real in the rest of LDLT