Fixed a bug that prevented set iterators from working at all, which

was breaking just about every algorithm when used on sets.


[SVN r29681]

libs/mpl

@@ -1 +1 @@
-Subproject commit eb00ae5d72f23f4627a3c358183437826db6429d
+Subproject commit 04278cf84bbea110f87ff5ed8524ba7e78a2deb3