- improve and comment the "BasicStuff" test.

- adjust behavior of Matrix(int,int) constructor
- s/EI_/EIGEN_/

src/Core/Sum.h

@@ -23,8 +23,8 @@
 // License. This exception does not invalidate any other reasons why a work
 // based on this file might be covered by the GNU General Public License.
 
-#ifndef EI_SUM_H
-#define EI_SUM_H
+#ifndef EIGEN_SUM_H
+#define EIGEN_SUM_H
 
 template<typename Lhs, typename Rhs> class Sum
   : public Object<typename Lhs::Scalar, Sum<Lhs, Rhs> >
@@ -48,7 +48,7 @@ template<typename Lhs, typename Rhs> class Sum
       : m_lhs(other.m_lhs), m_rhs(other.m_rhs) {}
       
     // assignments are illegal but we still want to intercept them and get clean compile errors
-    EI_INHERIT_ASSIGNMENT_OPERATORS(Sum)
+    EIGEN_INHERIT_ASSIGNMENT_OPERATORS(Sum)
 
   private:
     const Sum& _ref() const { return *this; }
@@ -80,4 +80,4 @@ Object<Scalar, Derived>::operator+=(const Object<Scalar, OtherDerived>& other)
   return *this = *this + other;
 }
 
-#endif // EI_SUM_H
+#endif // EIGEN_SUM_H