problem: upstreams may produce blocks with a heavy delay and replace …

[splix]

…existing head with an older block

solution: order conflicting head blocks by difficulty on PoW and priority on PoS

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 65.83333% with 41 lines in your changes are missing coverage. Please review.

Project coverage is 58.16%. Comparing base (d379d5d) to head (16768d0).

Files	Patch %	Lines
...n/io/emeraldpay/dshackle/upstream/MergedPosHead.kt	66.07%	13 Missing and 6 partials ⚠️
...n/io/emeraldpay/dshackle/upstream/MergedPowHead.kt	67.30%	10 Missing and 7 partials ⚠️
.../dshackle/upstream/ethereum/EthereumMultistream.kt	77.77%	1 Missing and 1 partial ⚠️
...emeraldpay/dshackle/startup/ConfiguredUpstreams.kt	0.00%	1 Missing ⚠️
...ay/dshackle/upstream/bitcoin/BitcoinMultistream.kt	0.00%	1 Missing ⚠️
.../dshackle/upstream/ethereum/EthereumRpcUpstream.kt	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #284      +/-   ##
============================================
+ Coverage     58.01%   58.16%   +0.15%     
- Complexity     1803     1844      +41     
============================================
  Files           278      279       +1     
  Lines          9839     9937      +98     
  Branches       1231     1262      +31     
============================================
+ Hits           5708     5780      +72     
- Misses         3465     3479      +14     
- Partials        666      678      +12     

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