Remove panics #1
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Add `ierrors` pkg as a wrapper around the stdlib
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Description of change
Removes the panic behavior on caching collisions. These cache collisions had the effect of killing the node, corrupting the db and making the snapshot essentially unusable. Recovery wasn't able to work on db's and snapshots that were present during this failure, and it killed every node on the network, so the errors are now instead logged and nil returns are in place of actions that would otherwise panic.