* Report progress percentage when downloading headers in IBD.
* Extract reporting logic to a separate type.
* Report progress for IBD missing block bodies.
* 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
