File correspondence checking

Hi @mortenvp , please take a look of this. I just added a line that says "    /// @todo Missing or incorrectly named unit test" in each of the source files "my_class.hpp" that contains class "my_class" and do not have a "test_my_class.cpp". There were new doxygen files because I tested locally the todo list. I'm not quite sure if I should have added them to the commit. Please let me know your opinion.