Add more macros for removed std lib features:

BOOST_NO_CXX98_FUNCTION_BASE
BOOST_NO_CXX98_BINDERS
Added new documentation section for features that have been removed from the standard.

test/boost_no_cxx98_function_base.ipp

@@ -0,0 +1,28 @@
+//  (C) Copyright John Maddock 2017.
+//  Use, modification and distribution are subject to the
+//  Boost Software License, Version 1.0. (See accompanying file
+//  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+//  See http://www.boost.org/libs/config for most recent version.
+
+//  MACRO:         BOOST_NO_CXX98_FUNCTION_BASE
+//  TITLE:         std::unary_function and std::binary_function
+//  DESCRIPTION:   The std lib has unary_function and binary_function.
+
+#include <functional>
+
+namespace boost_no_cxx98_function_base{
+
+struct A : public std::unary_function<int, int>{};
+struct B : public std::binary_function<int, int, int>{};
+
+int test()
+{
+   A a;
+   B b;
+   (void)a;
+   (void)b;
+   return static_cast<B::result_type>(0);
+}
+
+}