- Introduce aliasing system

- Remove operator<<, use .alias() instead
- Introduce operator/ (scalar)
- Cleanup, unit-tests update.

test/matrixmanip.cpp

@@ -37,6 +37,7 @@ template<typename MatrixType> void matrixManip(const MatrixType& m)
   a.block(1, rows-1, 1, cols-1);
   a.xpr().row(i) = b.row(i);
   a.xpr().minor(i, j) = b.block(1, rows-1, 1, cols-1);
+  a.alias().xpr().minor(i, j) = a.block(1, rows-1, 1, cols-1);
 }
 
 void EigenTest::testMatrixManip()

test/matrixops.cpp

@@ -44,7 +44,7 @@ template<typename MatrixType1,
   a = b;
   a = b + c;
   a = s * (b - c);
-  a << a + b;
+  a.alias() = a + b;
   
   MatrixType1 d(rows1, cols1);
   MatrixType2 e(rows2, cols2);

test/vectorops.cpp

@@ -42,7 +42,7 @@ template<typename VectorType> void vectorOps(const VectorType& v)
   a = b;
   a = b + c;
   a = s * (b - c);
-  a << a + b;
+  a.alias() = a + b;
 }
 
 void EigenTest::testVectorOps()