The graph adadptors can be alteration observed.
In most cases it uses the adapted graph alteration notifiers.
Only special case is now the UndirGraphAdaptor, where
we have to proxy the signals from the graph.

The SubBidirGraphAdaptor is removed, because it doest not
gives more feature than the EdgeSubGraphAdaptor<UndirGraphAdaptor<Graph>>.

The ResGraphAdaptor is based on this composition.

/// The namespace of LEMON

/// \todo Some more detailed description would be nice here.

///

namespace lemon {

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

  /// \todo Some more detailed description would be nice here.

  ///

  namespace concept {}

}