Redo commit eated by disk crash: add 'storage_begin()' and

'storage_end()' functions.


[SVN r18354]

libs/property_map

@@ -1 +1 @@
-Subproject commit 90a5e6125ff25276ee155146124a3aa73a38d031
+Subproject commit 03ac8fdd0c672865c23d14233246e1419183c5ab