[storage/index] fix + unit test for cursor update bug #1152
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Dropping a cursor in a middle of an iteration was resulting in dangling items. This PR will re-attach any dangling items in drop(). Unfortunately this means every cursor opened against an entry must end up traversing the entire list, even if the desired item is found right away. It also changes how items end up ordered after each cursor lifecycle.
Also makes every Index test have a "test_index" prefix.