Added Block Operations tutorial and code examples

doc/examples/Tutorial_BlockOperations_block_assignment.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace std;
+using namespace Eigen;
+
+int main()
+{
+  MatrixXf m(3,3), n(2,2);
+  
+  m << 1,2,3,
+       4,5,6,
+       7,8,9;
+       
+  // assignment through a block operation,
+  //  block as rvalue
+  n = m.block(0,0,2,2);
+  
+  //print n
+  cout << "n = " << endl << n << endl << endl;
+  
+  
+  n << 1,1,
+       1,1;
+        
+  // block as lvalue
+  m.block(0,0,2,2) = n;
+  
+  //print m
+  cout << "m = " << endl << m << endl;
+}

doc/examples/Tutorial_BlockOperations_colrow.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+using namespace Eigen;
+
+int main()
+{
+  MatrixXf m(3,3);
+  
+  m << 1,2,3,
+       4,5,6,
+       7,8,9;
+     
+  std::cout << "2nd Row: "
+    << m.row(1) << std::endl;
+}

doc/examples/Tutorial_BlockOperations_corner.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace std;
+using namespace Eigen;
+
+int main()
+{
+  MatrixXf m(4,4);
+  
+  m << 1, 2, 3, 4,
+       5, 6, 7, 8,
+       9, 10,11,12,
+       13,14,15,16;
+
+  //print first two columns
+  cout << "-- leftCols(2) --" << endl
+    << m.leftCols(2) << endl << endl;
+  
+  //print last two rows
+  cout << "-- bottomRows(2) --" << endl
+    << m.bottomRows(2) << endl << endl;
+    
+  //print top-left 2x3 corner
+  cout << "-- topLeftCorner(2,3) --" << endl
+    << m.topLeftCorner(2,3) << endl;
+}

doc/examples/Tutorial_BlockOperations_print_block.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+using namespace Eigen;
+
+int main()
+{
+  MatrixXf m(3,3);
+  
+  m << 1,2,3,
+       4,5,6,
+       7,8,9;
+     
+  std::cout << m.block(0,0,2,2) << std::endl;
+}

doc/examples/Tutorial_BlockOperations_vector.cpp

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+#include <Eigen/Dense>
+#include <iostream>
+
+using namespace std;
+using namespace Eigen;
+
+int main()
+{
+  VectorXf v(6);
+  
+  v << 1, 2, 3, 4, 5, 6;
+
+  //print first three elements
+  cout << "-- head(3) --" << endl
+    << v.head(3) << endl << endl;
+  
+  //print last three elements
+  cout << "-- tail(3) --" << endl
+    << v.tail(3) << endl << endl;
+    
+  //print between 2nd and 5th elem. inclusive
+  cout << "-- segment(1,4) --" << endl
+    << v.segment(1,4) << endl;
+}