* protobuf for new block template notification structs
* appmessage and wire for new block template notification structs
* Set up the entire handler/call-chain for managing the new-block-template event
* The first message is expected to contain headers and not a "done" message (+comment and error text fixes)
* Dequeue w/o timeout during pp anticone batch processing
* Add a verification step for catching possible new IBD errors
* Fetch missing bodies for both, syncer selected tip past and relay block past
* Make sure the syncer is behaving correctly to avoid out of index errors
* Make sure progress reporter does not exceed 100%
* No orphan roots, so no need to queue the empty list
* Add a log to report utxo fetch failure with err message
* A duplicate blocks should not appear as a warning
* typo
* Separate IBD to a new flow (so now invs are handled concurrently and no route capacity errors)
* Invs messages should be queued while waiting for BlockLocator msg
* Close IBD channel so that HandleIBDFlow exits too
* Apply flow separation to p2p protocol v4
* Manage the IBDRequestChannel through the Peer struct
* Some IBDs take a little longer
* Copy blockrelay flows to v4
* Remove duplicate sending of the same DAA blocks
* Advance testnet version
* Renames and add comments
* Add IBD test between v3 and v4
* Fix syncee v4 p2p version
* Check if netsync finished with selected tip
