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).

Document: lemon-refman

Title: LEMON Reference Manual

Author: LEMON Development Team

Abstract: Documentation of LEMON.

Section: unknown

Format: HTML

Index: /usr/share/doc/lemon/html/index.html

Files: /usr/share/doc/lemon/html/*.html