Solve a big issue with data alignment and dynamic allocation:

* add a WithAlignedOperatorNew class with overloaded operator new
* make Matrix (and Quaternion, Transform, Hyperplane, etc.) use it
  if needed such that "*(new Vector4) = xpr" does not failed anymore.
* Please: make sure your classes having fixed size Eigen's vector
  or matrice attributes inherit WithAlignedOperatorNew
* add a ei_new_allocator STL memory allocator to use with STL containers.
  This allocator really calls operator new on your types (unlike GCC's
  new_allocator). Example:
  std::vector<Vector4f> data(10);
  will segfault if the vectorization is enabled, instead use:
  std::vector<Vector4f,ei_new_allocator<Vector4f> > data(10);
NOTE: you only have to worry if you deal with fixed-size matrix types
with "sizeof(matrix_type)%16==0"...

Eigen/src/Geometry/Hyperplane.h

@@ -38,6 +38,9 @@
   */
 template <typename _Scalar, int _AmbientDim>
 class ParametrizedLine
+  #ifdef EIGEN_VECTORIZE
+  : public ei_with_aligned_operator_new<_Scalar,_AmbientDim>
+  #endif
 {
   public:
 
@@ -84,6 +87,9 @@ class ParametrizedLine
   */
 template <typename _Scalar, int _AmbientDim>
 class Hyperplane
+  #ifdef EIGEN_VECTORIZE
+  : public ei_with_aligned_operator_new<_Scalar,_AmbientDim==Dynamic ? Dynamic : _AmbientDim+1>
+  #endif
 {
   public:
 

Eigen/src/Geometry/Quaternion.h

@@ -59,6 +59,9 @@ template<typename _Scalar> struct ei_traits<Quaternion<_Scalar> >
 
 template<typename _Scalar>
 class Quaternion : public RotationBase<Quaternion<_Scalar>,3>
+  #ifdef EIGEN_VECTORIZE
+  , public ei_with_aligned_operator_new<_Scalar,4>
+  #endif
 {
   typedef RotationBase<Quaternion<_Scalar>,3> Base;
   typedef Matrix<_Scalar, 4, 1> Coefficients;

Eigen/src/Geometry/Scaling.h

@@ -41,6 +41,9 @@
   */
 template<typename _Scalar, int _Dim>
 class Scaling
+  #ifdef EIGEN_VECTORIZE
+  : public ei_with_aligned_operator_new<_Scalar,_Dim>
+  #endif
 {
 public:
   /** dimension of the space */

Eigen/src/Geometry/Transform.h

@@ -61,6 +61,9 @@ struct ei_transform_product_impl;
   */
 template<typename _Scalar, int _Dim>
 class Transform
+  #ifdef EIGEN_VECTORIZE
+  : public ei_with_aligned_operator_new<_Scalar,_Dim==Dynamic ? Dynamic : (_Dim+1)*(_Dim+1)>
+  #endif
 {
 public:
 

Eigen/src/Geometry/Translation.h

@@ -41,6 +41,9 @@
   */
 template<typename _Scalar, int _Dim>
 class Translation
+  #ifdef EIGEN_VECTORIZE
+  : public ei_with_aligned_operator_new<_Scalar,_Dim>
+  #endif
 {
 public:
   /** dimension of the space */