Changed boost::initialized_value from a class to an instance, to make its use more convenient, as discussed with Fernando.

[SVN r45685]

libs/utility

@@ -1 +1 @@
-Subproject commit ad0bcf4a00670df71a2ed0e10d98a51c954863ea
+Subproject commit 8efae71f4aa6f6721daa0fc7084869129305463b