- improve and comment the "BasicStuff" test.

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

test/main.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_TEST_MAIN_H
-#define EI_TEST_MAIN_H
+#ifndef EIGEN_TEST_MAIN_H
+#define EIGEN_TEST_MAIN_H
 
 #include <QtTest/QtTest>
 #include "../src/Core.h"
@@ -47,4 +47,4 @@ class EigenTest : public QObject
     void testBasicStuff();
 };
 
-#endif // EI_TEST_MAIN_H
+#endif // EIGEN_TEST_MAIN_H