The documentation can be generated using 'Doxygen' Version 1.7.2 or higher (http://www.doxygen.org). You also need the 'dot' tool provided by 'Graphviz' (http://www.graphviz.org).
First install both software packages as denoted on their web sites.
Then you can either generate the documentation using the graphical tool 'Doxywizard' or by running 'Doxygen' on the console:
Run doxywizard and open the file 'Doxyfile'. Then open the 'Run' tab (below 'Step 2') and click on 'Run doxygen'. Now the documentation is generated.
doxygen. Now you should have an 'html' folder in './doc'. Open './doc/html/index.html' to browse through the documentation.
Documentation generated by Doxygen