- rework the coefficients API

- make vectors use a separate loop unroller, so that copying a
row-vector into a col-vector is now possible
- add much more documentation
- misc improvements

doc/snippets/MatrixBase_block.cpp

@@ -0,0 +1,3 @@
+Matrix4d m = Matrix4d::diagonal(Vector4d(1,2,3,4));
+m.block<2, 2>(2, 0) = m.block<2, 2>(2, 2);
+cout << m << endl;

doc/snippets/MatrixBase_cast.cpp

@@ -0,0 +1,3 @@
+Matrix2d md = Matrix2d::identity() * 0.45;
+Matrix2f mf = Matrix2f::identity();
+cout << md + mf.cast<double>() << endl;

doc/snippets/MatrixBase_col.cpp

@@ -0,0 +1,3 @@
+Matrix3d m = Matrix3d::identity();
+m.col(1) = Vector3d(4,5,6);
+cout << m << endl;

doc/snippets/MatrixBase_dynBlock.cpp

@@ -1,3 +1,3 @@
-Matrix4d m = Matrix4d::identity();
-m.dynBlock(2,0,2,2) = m.dynBlock(0,0,2,2);
+Matrix3d m = Matrix3d::diagonal(Vector3d(1,2,3));
+m.dynBlock(1, 0, 2, 1) = m.dynBlock(1, 1, 2, 1);
 cout << m << endl;

doc/snippets/MatrixBase_row.cpp

@@ -0,0 +1,3 @@
+Matrix3d m = Matrix3d::identity();
+m.row(1) = Vector3d(4,5,6);
+cout << m << endl;

doc/snippets/compile_snippet.cpp.in

@@ -1,5 +1,5 @@
 #include <Eigen/Core.h>
-USING_EIGEN_DATA_TYPES
+USING_PART_OF_NAMESPACE_EIGEN
 using namespace std;
 int main(int, char**)
 {