- add validation on TxMsg checking for nil
- add test for nil transaction
- add test for zero value transaction (no extra validation needed)

- rename Validate -> ValidateFields not to confure consensus block validation
- add nil transaction and nil uncle header validation
- remove bigint field checks: rlp already decodes *big.Int to big.NewInt(0)
- add test for nil header, nil transaction

- add validate method to types.Block
- validate after Decode -> error
- add tests for NewBlockMsg

Frontier/513

Configurable CORS domain

Actually verifies output as by regex

* Added new CreateAccount method which properly overwrites previous
  accounts (excluding balance)
* Fixed block tests (100% success)

Improving this in the future will allow for cleaning up a bit of legacy
code.

Now formats based on underlying hexdata or hexnum type. Fields directly
with respective constructors that cover from native types

Benefits from automatic output formatting differences between
quantities and data

29da5ea add JS block test example as state test
04108e0 Merge remote-tracking branch 'origin' into develop
6da7f35 JS failures
22b5dfc stQuadraticComplexity Refill with latest develop
c97bf26 Memory / Solidity Test Update

git-subtree-dir: tests/files
git-subtree-split: 29da5ea53ab36d74bd3c0712337168086cabfb8d

Update Go bootnode address

Correct gas limit validation according to new algorithm

Requirements for calls differ from transactions

* Use absolute value of (block's gas limit) - (parent's gas limit)
  in comparison with diff limit.
* Ensure the diff is strictly smaller than the allowed size.