* Replace header finality point with pruning point
* Fix TestTransactionAcceptance
* Fix pruning candidate
* Store all past pruning points
* Pass pruning points on IBD
* Add blue score to block header
* Simplify ArePruningPointsInValidChain
* Fix static check errors
* Fix genesis
* Renames and text fixing
* Use ExpectedHeaderPruningPoint in block builder
* Fix TestCheckPruningPointViolation
* Replace the old parents in the block header with BlockLevelParents.
* Begin fixing compilation errors.
* Implement database serialization for block level parents.
* Implement p2p serialization for block level parents.
* Implement rpc serialization for block level parents.
* Add DirectParents() to the block header interface.
* Use DirectParents() instead of Parents() in some places.
* Revert test_block_builder.go.
* Add block level parents to hash serialization.
* Use the zero hash for genesis finality points.
* Fix failing tests.
* Fix a variable name.
* Update headerEstimatedSerializedSize.
* Add comments in blocklevelparents.go.
* Fix the rpc-stability stability test.
* Change the field number for `parents` fields in p2p.proto and rpc.proto.
* Remove MsgBlockHeader::NumParentBlocks.
* Add DAAScore, BlueWork, and FinalityPoint to externalapi.BlockHeader.
* Add DAAScore, BlueWork, and FinalityPoint to NewImmutableBlockHeader and fix compilation errors.
* Add DAAScore, BlueWork, and FinalityPoint to protowire header types and fix failing tests.
* Check for header DAA score in validateDifficulty.
* Add DAA score to buildBlock.
* Fix failing tests.
* Add a blue work check in validateDifficultyDAAAndBlueWork.
* Add blue work to buildBlock and fix failing tests.
* Add finality point validation to ValidateHeaderInContext.
* Fix genesis blocks' finality points.
* Add finalityPoint to blockBuilder.
* Fix tests that failed due to missing reachability data.
* Make blockBuilder use VirtualFinalityPoint instead of directly calling FinalityPoint with the virtual hash.
* Don't validate the finality point for blocks with trusted data.
* Add debug logs.
* Skip finality point validation for block whose finality points are the virtual genesis.
* Revert "Add debug logs."
This reverts commit 3c18f519ccbb382f86f63904dbb1c4cd6bc68b00.
* Move checkDAAScore and checkBlueWork to validateBlockHeaderInContext.
* Add checkCoinbaseBlueScore to validateBodyInContext.
* Fix failing tests.
* Add DAAScore, blueWork, and finalityPoint to blocks' hashes.
* Generate new genesis blocks.
* Fix failing tests.
* In BuildUTXOInvalidBlock, get the bits from StageDAADataAndReturnRequiredDifficulty instead of calling RequiredDifficulty separately.
