Added images to the dataspace documentation

Update #110

doc/source/images/CMakeLists.txt

@@ -10,6 +10,9 @@ set(IMAGES attribute_manager_uml.png
            hdf5_node_types.svg
            hdf5_dataspaces.svg
            hdf5_selections.svg
+           static_dataspace.svg
+           dynamic_dataspace_bounded.svg
+           dynamic_dataspace_unbounded.svg
            )
 
 add_sphinx_source(${IMAGES})

doc/source/users_guide/dataspace.rst

@@ -106,17 +106,25 @@ To create a simple dataspace with fixed dimensions use
     Dimensions current = space.current_dimensions(); // {2,3}
     Dimensions maximum = space.maximum_dimensions(); // {2,3} too
     
+.. figure:: ../images/static_dataspace.svg
+   :align: center
+   :width: 20%
+
 which will result in a dataspace of rank 2 with 6 elements. To build  an 
 extensible dataspace with fixed bounds we could use 
 
 .. code-block:: cpp
 
     using namespace hdf5;
     
-    dataspace::Simple space({2,3},{10,100}); 
+    dataspace::Simple space({2,3},{10,10}); 
     
     space.current_dimensions(); // {2,3}
-    space.maximum_dimensions(); // {10,100}
+    space.maximum_dimensions(); // {10,10}
+    
+.. figure:: ../images/dynamic_dataspace_bounded.svg
+   :align: center
+   :width: 40%
 
 Finally, for an extensible dataspace with an unlimited number of elements 
 along a dimension we could use 
@@ -127,6 +135,10 @@ along a dimension we could use
     
     dataspace::Simple space({1},{dataspace::Simple::UNLIMITED}); 
     
+.. figure:: ../images/dynamic_dataspace_unbounded.svg
+   :align: center
+   :width: 30%
+
 The initial size of the dataspace  would be 1. However, we could extend it 
 as much as we want (basically can). We will see later how to use this feature
 along with datasets.