* sends wantBlock to peers with block. wantHave to everyone else
* Cleanup cheapestPeer. Fixes test for peers lists
* Fixes issue where peerWants are only stored for type wantBlock.
* Review comments by Dmitriy
* consistent logging of addresses
* prevents duplicate scheduling. Fixes cancellation
* fast
* Marks cancel-presence situation with todo comment.
* fixtest: testsales enable logging
* Review by Dmitriy: Remember peerWants only if we don't have them.
* rework `wantListHandler` handling
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Co-authored-by: Dmitriy Ryajov <dryajov@gmail.com>
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