Adding empty example for round stat integration

Addresses #543
Updated Pools
Merge pull request #637 from Dids/next

Updated Pools
Merge branch 'next' into issue-543
obigals work, cherrypicked
further implemetation into mmcfe-ng
proper allow back/forth on blocks
indentations
Merge pull request #641 from TheSerapher/issue-543

Issue 543
fixing blockhash in round block details
removing debug echos
fixing some PHP warnings
Merge branch 'next' of https://github.com/TheSerapher/php-mmcfe-ng into next
Merge branch 'next' into issue-444-theserapher
Adding round statistics