Resurrection-conflict-minimized state bounding, take 2

I think you can get away with something simpler: the contract has a child contract for each address space, and stores data relevant to accounts in address space e in the storage of the child contract in address space e. We could also just add a SSTORE_TO_ADDRESS_SPACE and SLOAD_FROM_ADDRESS_SPACE opcode that allows contracts to access the storage of themselves in different address spaces.

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