core (memory/persistent): fixed "items", added "all" + "adel" to LazyPersistentBinaryDict: - `items` was returning the dict with all values, it now returns a Deferred with actual dict items() - `all` new method does return the dict with all values (in a Deferred) - `adel` has been added to LazyPersistentBinaryDict

You'll find install instructions in documentation (see doc/installation.rst).

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