EIP100 - Difficulty adjustment including uncles

[gumb0]

#3614
ethereum/EIPs#100

[codecov-io]

Codecov Report

Merging #4017 into develop will increase coverage by 0.02%.
The diff coverage is 100%.

@@             Coverage Diff             @@
##           develop    #4017      +/-   ##
===========================================
+ Coverage    64.93%   64.95%   +0.02%     
===========================================
  Files          306      307       +1     
  Lines        21350    21400      +50     
===========================================
+ Hits         13864    13901      +37     
- Misses        7486     7499      +13

Impacted Files	Coverage Δ
libethashseal/Ethash.cpp	85.82% <100%> (+0.43%)	⬆️
libethcore/BlockHeader.h	79.06% <100%> (+2.87%)	⬆️
test/unittests/libethashseal/EthashTest.cpp	100% <100%> (ø)
test/tools/fuzzTesting/fuzzHelper.cpp	13.19% <0%> (-8.13%)	⬇️
libp2p/NodeTable.cpp	39.37% <0%> (+0.31%)	⬆️
libdevcore/Worker.cpp	93.33% <0%> (+2.22%)	⬆️

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[chfast]

Very nice, indeed 👍.