changed algorithm for iterator_facade::iterator_category

and for filter_iterator


[SVN r21686]

libs/iterator

@@ -1 +1 @@
-Subproject commit 45e90e01348b6a8fe1ea23f6c716a2d1acf7d75c
+Subproject commit c6a5b7c292c819b897329d6e27c4ac4108f93482