An easy avoiding of a bug

The functional interfaces are removed.
Better solution could be a reference counted core of the io interfaces

Now it is huge work so just write that:

GraphReader<ListGraph>(std::cin, graph).

Instead of:

graphReader(std::cin, graph).

 /// The namespace of LEMON

 /// The namespace of LEMON

 ///

 namespace lemon {

   /// The namespace of LEMON concepts and concept checking classes

   /// The namespace of LEMON concepts and concept checking classes

   ///

   namespace concept {}

 }