Fix potential issues with chequebooks in case of forks

[ralph-pichler]

In case of chain forks there might be issue concerning replay of transactions on chequebooks or factories deployed to the same addresses. Or cheques being cashed on another chain.

Todo: [ ] Analyse what problems could occur [ ] Adjust factory and chequebook contracts accordingly [ ] Once ropsten transitions to Istanbul include CHAIN_ID in cheques [ ] Adjust the go code accordingly