generalized ei_traits<>.
Finally the importing macro is named EIGEN_BASIC_PUBLIC_INTERFACE
because it does not only import the ei_traits, it also makes the base class
a friend, etc.
diff --git a/test/linearstructure.cpp b/test/linearstructure.cpp
index 593f9e7..475c632 100644
--- a/test/linearstructure.cpp
+++ b/test/linearstructure.cpp
@@ -33,7 +33,7 @@
   */
 
   typedef typename MatrixType::Scalar Scalar;
-  typedef Matrix<Scalar, MatrixType::Traits::RowsAtCompileTime, 1> VectorType;
+  typedef Matrix<Scalar, MatrixType::RowsAtCompileTime, 1> VectorType;
   
   int rows = m.rows();
   int cols = m.cols();
@@ -44,9 +44,9 @@
              m2 = MatrixType::random(rows, cols),
              m3(rows, cols),
              mzero = MatrixType::zero(rows, cols),
-             identity = Matrix<Scalar, MatrixType::Traits::RowsAtCompileTime, MatrixType::Traits::RowsAtCompileTime>
+             identity = Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime>
                               ::identity(rows, rows),
-             square = Matrix<Scalar, MatrixType::Traits::RowsAtCompileTime, MatrixType::Traits::RowsAtCompileTime>
+             square = Matrix<Scalar, MatrixType::RowsAtCompileTime, MatrixType::RowsAtCompileTime>
                               ::random(rows, rows);
   VectorType v1 = VectorType::random(rows),
              v2 = VectorType::random(rows),