Created branch to extend PropertyMap:

add a readable functor map that calls a given functor or function upon lookup.
Ideas from: http://comments.gmane.org/gmane.comp.lib.boost.user/54397
and: http://comments.gmane.org/gmane.comp.lib.boost.user/73358


[SVN r77438]

include/boost/fusion/tuple.hpp

@@ -13,3 +13,4 @@
 #include <boost/fusion/container/generation/ignore.hpp>
 
 #endif
+

include/boost/fusion/tuple/detail/preprocessed/tuple.hpp

@@ -18,4 +18,5 @@
 #include <boost/fusion/tuple/detail/preprocessed/tuple50.hpp>
 #else
 #error "FUSION_MAX_VECTOR_SIZE out of bounds for preprocessed headers"
-#endif
+#endif
+

include/boost/fusion/tuple/tuple.hpp

@@ -112,3 +112,4 @@ namespace boost { namespace fusion
 #endif // BOOST_FUSION_DONT_USE_PREPROCESSED_FILES
 
 #endif
+

include/boost/fusion/tuple/tuple_fwd.hpp

@@ -48,3 +48,4 @@ namespace boost { namespace fusion
 #endif // BOOST_FUSION_DONT_USE_PREPROCESSED_FILES
 
 #endif
+