Antioch - Progress Update Q4 2020

Just a quick update to cover the past couple of weeks.

Spent a bunch of time investigating and tracking down an issue related to 4.1.0 when syncing from a 4.0.x node against a more recent 4.1.0 node.

This was fixed here - https://github.com/mimblewimble/grin/pull/3465

Bugfix release here - https://grin.mw/blog/2020/10/08/grin-node-411-released.html

I have also been working on reviewing @jaspervdm PRs related to PIBD.

Big one here - https://github.com/mimblewimble/grin/pull/3453

Also spent some time making progress toward improved “flexible peer filtering” - https://github.com/mimblewimble/grin/pull/3458
We are going to want to be more flexible with selecting peers to sync from once we start supporting PIBD (alongside existing txhashset archive) and this is a step toward supporting this.

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