merge new MPL version from 'mplbook' branch

[SVN r24874]

include/boost/indirect_reference.hpp

@@ -10,7 +10,7 @@
 # include <boost/detail/is_incrementable.hpp>
 # include <boost/iterator/iterator_traits.hpp>
 # include <boost/type_traits/remove_cv.hpp>
-# include <boost/mpl/apply_if.hpp>
+# include <boost/mpl/eval_if.hpp>
 # include <boost/pointee.hpp>
 
 namespace boost { 
@@ -26,7 +26,7 @@ namespace detail
 
 template <class P>
 struct indirect_reference
-  : mpl::apply_if<
+  : mpl::eval_if<
         detail::is_incrementable<P>
       , iterator_reference<P>
       , detail::smart_ptr_reference<P>