Introduce preferred download peers
RPC: submitblock: Support for returning specific rejection reasons
Remove file and class order guidelines
Merge pull request #5201 from sipa/order

Remove file and class order guidelines
Merge pull request #5157

b4ee0bd Introduce preferred download peers (Pieter Wuille)
Merge pull request #3727

e69a587 RPC: submitblock: Support for returning specific rejection reasons (Luke Dashjr)