New method Memcached_DataObject::pivotGet()
This method lets you get all the objects with a given variable key and another set of "fixed" keys. A good example is getting all the avatars for a notice list; the avatar size stays the same, but the IDs change. Since it's very similar to multiGet(), I refactored that function to use pivotGet(). And, yes, I realize these are kind of hard to follow.
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