Avoid including <iterator>, use intrusive's own version to avoid ADL clashes and minimize some dependencies.

test/list_test.cpp

@@ -1,4 +1,3 @@
-/*
 /////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Olaf Krzikalla 2004-2006.
@@ -541,11 +540,3 @@ int main()
 
    return boost::report_errors();
 }
-*/
-
-#include <boost/intrusive/list_hook.hpp>
-
-int main()
-{
-   return 0;
-}