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diff --git a/extern/Eigen2/Eigen/src/Core/NumTraits.h b/extern/Eigen2/Eigen/src/Core/NumTraits.h
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--- a/extern/Eigen2/Eigen/src/Core/NumTraits.h
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-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra. Eigen itself is part of the KDE project.
-//
-// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
-//
-// Eigen is free software; you can redistribute it and/or
-// modify it under the terms of the GNU Lesser General Public
-// License as published by the Free Software Foundation; either
-// version 3 of the License, or (at your option) any later version.
-//
-// Alternatively, you can redistribute it and/or
-// modify it under the terms of the GNU General Public License as
-// published by the Free Software Foundation; either version 2 of
-// the License, or (at your option) any later version.
-//
-// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
-// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
-// GNU General Public License for more details.
-//
-// You should have received a copy of the GNU Lesser General Public
-// License and a copy of the GNU General Public License along with
-// Eigen. If not, see <http://www.gnu.org/licenses/>.
-
-#ifndef EIGEN_NUMTRAITS_H
-#define EIGEN_NUMTRAITS_H
-
-/** \class NumTraits
-  *
-  * \brief Holds some data about the various numeric (i.e. scalar) types allowed by Eigen.
-  *
-  * \param T the numeric type about which this class provides data. Recall that Eigen allows
-  *          only the following types for \a T: \c int, \c float, \c double,
-  *          \c std::complex<float>, \c std::complex<double>, and \c long \c double (especially
-  *          useful to enforce x87 arithmetics when SSE is the default).
-  *
-  * The provided data consists of:
-  * \li A typedef \a Real, giving the "real part" type of \a T. If \a T is already real,
-  *     then \a Real is just a typedef to \a T. If \a T is \c std::complex<U> then \a Real
-  *     is a typedef to \a U.
-  * \li A typedef \a FloatingPoint, giving the "floating-point type" of \a T. If \a T is
-  *     \c int, then \a FloatingPoint is a typedef to \c double. Otherwise, \a FloatingPoint
-  *     is a typedef to \a T.
-  * \li An enum value \a IsComplex. It is equal to 1 if \a T is a \c std::complex
-  *     type, and to 0 otherwise.
-  * \li An enum \a HasFloatingPoint. It is equal to \c 0 if \a T is \c int,
-  *     and to \c 1 otherwise.
-  */
-template<typename T> struct NumTraits;
-
-template<> struct NumTraits<int>
-{
-  typedef int Real;
-  typedef double FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 0,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-template<> struct NumTraits<float>
-{
-  typedef float Real;
-  typedef float FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 1,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-template<> struct NumTraits<double>
-{
-  typedef double Real;
-  typedef double FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 1,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-template<typename _Real> struct NumTraits<std::complex<_Real> >
-{
-  typedef _Real Real;
-  typedef std::complex<_Real> FloatingPoint;
-  enum {
-    IsComplex = 1,
-    HasFloatingPoint = NumTraits<Real>::HasFloatingPoint,
-    ReadCost = 2,
-    AddCost = 2 * NumTraits<Real>::AddCost,
-    MulCost = 4 * NumTraits<Real>::MulCost + 2 * NumTraits<Real>::AddCost
-  };
-};
-
-template<> struct NumTraits<long long int>
-{
-  typedef long long int Real;
-  typedef long double FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 0,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-template<> struct NumTraits<long double>
-{
-  typedef long double Real;
-  typedef long double FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 1,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-template<> struct NumTraits<bool>
-{
-  typedef bool Real;
-  typedef float FloatingPoint;
-  enum {
-    IsComplex = 0,
-    HasFloatingPoint = 0,
-    ReadCost = 1,
-    AddCost = 1,
-    MulCost = 1
-  };
-};
-
-#endif // EIGEN_NUMTRAITS_H