* [NOD-1038] Give higher priority for requesting missing ancestors when sending a getdata message (#767)
* [NOD-1060] Don't sync from peers that break the netsync protocol
* [NOD-858] Don't switch sync peer if the syncing process hasn't yet started with the current sync peer
* [NOD-858] SetShouldSendBlockLocator(false) on OnBlockLocator
* [NOD-858] Rename shouldSendBlockLocator->wasBlockLocatorRequested
* [NOD-858] Move panic to shouldReplaceSyncPeer
* [NOD-648] Add TestProcessDelayedBlocks
* [NOD-648] Add one second to secondsUntilDelayedBlockIsValid to make sure the delayedBlock timestamp will be valid, and add comments
* [NOD-648] Remove redundant import
* [NOD-648] Use fakeTimeSource instead of time.Sleep
* [NOD-648] Rename dag.HaveBlock->dag.IsKnownBlock, dag.BlockExists->dag.IsInDAG
* [NOD-648] Add comment
* [NOD-641] Rename HaveBlock->IsKnownBlock, BlockExists->IsInDAG
* [NOD-652] Add selectedTip and getSelectedTip messages
* [NOD-652] Remove peerSyncState.isSelectedTipKnown
* [NOD-652] Do nothing on OnSelectedTip if the peer selected tip hasn't changed
* [NOD-652] Handle selected tip message with block handler
* [NOD-652] Add comments
* [NOD-652] go mod tidy
* [NOD-652] Fix TestVersion
* [NOD-652] Use dag.AdjustedTime instead of dag.timeSource.AdjustedTime
* [NOD-652] Create shouldQueryPeerSelectedTips and queueMsgGetSelectedTip functions
* [NOD-652] Change selectedTip to selectedTipHash where needed
* [NOD-652] add minDAGTimeDelay constant
* [NOD-652] add comments
* [NOD-652] Fix names and comments
* [NOD-652] Put msg.reply push in the right place
* [NOD-652] Fix comments and names
* [NOD-669] Remove the "get" from getBlueBlocksBetween.
* [NOD-669] Remove the "Get" from GetBlueBlocksHeadersBetween.
* [NOD-669] In blueBlocksBetween, rename startHash to lowHash and stopHash to highHash.
* [NOD-669] Rename startHash to lowHash and stopHash to highHash in blockLocator logic.
* [NOD-669] Remove zeroHash logic in blockLocator.
* [NOD-669] Finish renaming startHash and stopHash in blockdag.
* [NOD-669] Rename startHash and stopHash in blockdag where I previously missed it.
* [NOD-669] Rename startHash and stopHash in blockdag where I previously missed it some more.
* [NOD-669] Rename startHash and stopHash in blockdag where I previously missed it some more some more.
* [NOD-669] Fix bad grammar in method names.
* [NOD-669] Rename lowHash to blockHash in SelectedParentChain.
* [NOD-669] Fix a comment.
* [NOD-502] Remove checkpoints.
* [NOD-502] Remove remaining references to checkpoints.
* [NOD-500] Split RejectFinality to RejectDifficulty.
* [NOD-500] Remove support for headers-first in p2p.
* [NOD-500] Panic in newHashFromStr in case of an error.
