Commits on Feb 19, 2018

1. ECIP 1041 - Remove Difficulty Bomb (#7905) …

   Enable difficulty bomb defusion at block:
    - 5900000 on Ethereum Classic mainnet,
    - 2300000 on morden testnet.
   
   Reference:
   https://github.com/ethereumproject/ECIPs/blob/master/ECIPs/ECIP-1041.md

   

   tzdybal authored and andresilva committed Feb 19, 2018
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2. spec: Validate required divisor fields are not 0 (#7933) …

   * Add validate_non_zero function
   
   It's used to validate that a Spec's uint field used as a divisor is not zero.
   
   * Add deserialize_with to gas_limit_bound_divisor
   
   Prevents panics due to divide-by-zero on the gas_limit_bound_divisor
   field.
   
   * Add deserialize_with to difficulty_bound_divisor
   
   Prevents panics due to divide-by-zero on the difficulty_bound_divisor
   field.
   
   * Add validate_optional_non_zero function
   
   Used to validate Option<Uint> divisor fields.
   
   * Use deserialize_with on optional divisor fields.
   
   * Add #[serde(default)] attribute to divisor fields
   
   When using `#[serde(deserialize_with)]`, `#[serde(default)]` must be specified so that missing
   fields can be deserialized with the deserializer for `None`.

   

   asymmetric authored and andresilva committed Feb 19, 2018
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3. Kovan WASM fork code (#7849) …

   * kovan fork code
   
   * introduce ethcore level vm_factory and let it fail
   
   * fix json tests
   
   * wasmcosts as option
   
   * review changes
   
   * wasm costs in parser
   
   * fix evm tests
   
   * review fixes
   
   * fix test
   
   * remove redundant json field

   

   NikVolf authored and andresilva committed Feb 19, 2018
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