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diff --git a/extern/Eigen2/Eigen/src/Core/DiagonalCoeffs.h b/extern/Eigen2/Eigen/src/Core/DiagonalCoeffs.h
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--- a/extern/Eigen2/Eigen/src/Core/DiagonalCoeffs.h
+++ /dev/null
@@ -1,124 +0,0 @@
-// 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_DIAGONALCOEFFS_H
-#define EIGEN_DIAGONALCOEFFS_H
-
-/** \class DiagonalCoeffs
-  *
-  * \brief Expression of the main diagonal of a matrix
-  *
-  * \param MatrixType the type of the object in which we are taking the main diagonal
-  *
-  * The matrix is not required to be square.
-  *
-  * This class represents an expression of the main diagonal of a square matrix.
-  * It is the return type of MatrixBase::diagonal() and most of the time this is
-  * the only way it is used.
-  *
-  * \sa MatrixBase::diagonal()
-  */
-template<typename MatrixType>
-struct ei_traits<DiagonalCoeffs<MatrixType> >
-{
-  typedef typename MatrixType::Scalar Scalar;
-  typedef typename ei_nested<MatrixType>::type MatrixTypeNested;
-  typedef typename ei_unref<MatrixTypeNested>::type _MatrixTypeNested;
-  enum {
-    RowsAtCompileTime = int(MatrixType::SizeAtCompileTime) == Dynamic ? Dynamic
-                      : EIGEN_ENUM_MIN(MatrixType::RowsAtCompileTime,
-                                       MatrixType::ColsAtCompileTime),
-    ColsAtCompileTime = 1,
-    MaxRowsAtCompileTime = int(MatrixType::MaxSizeAtCompileTime) == Dynamic ? Dynamic
-                            : EIGEN_ENUM_MIN(MatrixType::MaxRowsAtCompileTime,
-                                             MatrixType::MaxColsAtCompileTime),
-    MaxColsAtCompileTime = 1,
-    Flags = (unsigned int)_MatrixTypeNested::Flags & (HereditaryBits | LinearAccessBit),
-    CoeffReadCost = _MatrixTypeNested::CoeffReadCost
-  };
-};
-
-template<typename MatrixType> class DiagonalCoeffs
-   : public MatrixBase<DiagonalCoeffs<MatrixType> >
-{
-  public:
-
-    EIGEN_GENERIC_PUBLIC_INTERFACE(DiagonalCoeffs)
-
-    inline DiagonalCoeffs(const MatrixType& matrix) : m_matrix(matrix) {}
-
-    EIGEN_INHERIT_ASSIGNMENT_OPERATORS(DiagonalCoeffs)
-
-    inline int rows() const { return std::min(m_matrix.rows(), m_matrix.cols()); }
-    inline int cols() const { return 1; }
-
-    inline Scalar& coeffRef(int row, int)
-    {
-      return m_matrix.const_cast_derived().coeffRef(row, row);
-    }
-
-    inline const Scalar coeff(int row, int) const
-    {
-      return m_matrix.coeff(row, row);
-    }
-
-    inline Scalar& coeffRef(int index)
-    {
-      return m_matrix.const_cast_derived().coeffRef(index, index);
-    }
-
-    inline const Scalar coeff(int index) const
-    {
-      return m_matrix.coeff(index, index);
-    }
-
-  protected:
-
-    const typename MatrixType::Nested m_matrix;
-};
-
-/** \returns an expression of the main diagonal of the matrix \c *this
-  *
-  * \c *this is not required to be square.
-  *
-  * Example: \include MatrixBase_diagonal.cpp
-  * Output: \verbinclude MatrixBase_diagonal.out
-  *
-  * \sa class DiagonalCoeffs */
-template<typename Derived>
-inline DiagonalCoeffs<Derived>
-MatrixBase<Derived>::diagonal()
-{
-  return DiagonalCoeffs<Derived>(derived());
-}
-
-/** This is the const version of diagonal(). */
-template<typename Derived>
-inline const DiagonalCoeffs<Derived>
-MatrixBase<Derived>::diagonal() const
-{
-  return DiagonalCoeffs<Derived>(derived());
-}
-
-#endif // EIGEN_DIAGONALCOEFFS_H