Restore Contract Code at 0x863DF6BFa4469f3ead0bE8f9F2AAE51c91A907b4 (e…

…thereum#999)

* Claim a random number

* Add specification

* Add rationale

* Improve wording

* Improve formatting

* Improve wording

* Specify the account values for balance, nonce, code, and storage

* Be more specific about a hard-fork

* Add poc implementation for Parity

* Improve formatting

* Improve formatting

* Make sure the total supply will be unchanged.

* Point to relevant changes in chain spec.

* Remove contracts/ethereum#74 code from the proposal.

* Use the old but patched library

* Highlight differences to the initially deployed contract

* Add code and storage for the stateDiff

* Update resources

* Update resources

* Add correct discussion URL

* Standard Track -> Standards Track

* Link the PR for Parity

* Rationale on unchanged Ether supply

* Split specification alternatives via bytecode vs. codehash