Added to possibility to compile unit tests at maximum warning level.

Silenced (amongst others) many conversion related warnings.

Eigen/src/Core/SelfAdjointView.h

@@ -150,8 +150,10 @@ template<typename MatrixType, unsigned int UpLo> class SelfAdjointView
     const LDLT<PlainMatrixType> ldlt() const;
 
   protected:
-
     const typename MatrixType::Nested m_matrix;
+
+  private:
+    SelfAdjointView& operator=(const SelfAdjointView&);
 };