Proof-of-concept of PoH fully implemented (v0.1.0)

New Features

• PoH, as a proof-of-concept, is now fully implemented including Layer 2 and Layer 1 operations
• PoH algorithm modified to be more like final approach:
  -initial data/tx/msg is not put in the blockchain, only its hash
  -hash created by a node is taking the tx hash and the fingerprint of the upper layer
• An initial blockchain is now running with a consensus done among Layer 1 nodes with enabled PoH service
• Decentralized MongoDB installation is now part of the installation script
• Installation script has been modified to provide modularity and easy reinitialization
• Writing in batches to MongoDB has been implemented in a dedicated thread to ensure time critical correct operation
• RabbitMQ messages sending is now done in batches for performance improvement
• Improve signature verification speed by allowing poh nodes to keep a local copy of all nodes public keys.
• Client stresstest improved for more accurate testing of PoH
• Client basic now notifies back when a PoH message has been validated through the whole network and also when the msg/tx has been added to a new block on the blockchain
• Client basic has now a black background

Bug Fixes

• Fixed bug in client basic for data_storage when sending a new file after a first one
• Fixed bug in service_poh where blocks were rejected too quickly