rollback to mainnet config and Change two constants to config and add pruning block storing

[AurelienFT]

• [x] document all added functions
• [x] try in sandbox /simulation/labnet
  • [ ] if part of node-launch, checked using the resync_check flag
• [x] unit tests on the added/changed features
  • [x] make tests compile
  • [x] make tests pass
• [x] add logs allowing easy debugging in case the changes caused problems
• [ ] if the API has changed, update the API specification