revert the hashing of nodes in commit #380
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This reverts a workaround in which children of
InternalNodes whose commitment were updated, were replaced byHashedNodes. This meant that any further access to these nodes would require a node resolution, and this causes a lot of problems e.g. with proof creation, as a tree whose root hash was computed required loading the tree structure from disk in order to get proof items.The initial performance problem has been fixed in gballet/go-ethereum#242 and so this can be reverted.