Release 1.6.0

Backported following changes from vNext into the v1.6:

• Replace raw disk files (i.e. blocks and TXs) with the DB storage.
• Prevent TX submission if nonce is not greater than current address nonce.
• Delete TXs below min fee from the pool.
• Provide TX pool info by address.

Release 1.5.7

• Added support for installing the node on CentOS 8.

Release 1.5.6

• Fixed the issue with inconsistent block configuration structure at the activation of dormant validator logic.

Release 1.5.5

• Intermediate release for diagnostic purpose

Release 1.5.4

• Activate dormant validator logic on MAINNET at block 1330000.

Release 1.5.3

• Activated last proposed block tracking on MAINNET at block 1300000.

Release 1.5.2

• Removed tracking of last proposed block until defined point in chain, to ensure full sync compatibility.

Release 1.5.1

• Activated dormant validator handling on TESTNET.

Release 1.5.0

• Implemented automatic disabling of dormant validators.

Release 1.4.8

• Don't allow removing a validator at the point of inclusion in the new active set.
• Exposed additional fields in validators API endpoint.