PandoraMarket shall use logs to keep Kernels/Datasets instead of storage

[dr-orlovsky]

Ethereum logs present a better way to keep the data which are not required to be accessed by the smart contract itself but have to be accessed only with a frontend:

https://media.consensys.net/technical-introduction-to-events-and-logs-in-ethereum-a074d65dd61e

https://ethereum.stackexchange.com/questions/1302/where-do-contract-event-logs-get-stored-in-the-ethereum-architecture