Fix typo in release notes

Remove chain.h as an include from validation.h

Update release notes

Fix a comment

Whoops

In D1933#63943, @deadalnix wrote:

There was a backport from core that did something very similar. While I do think the design of this patch is better than the one from core, I'd be hesitant to go for it as we'd have to maintain it rather than letting core handle that one.

Fix missing newline

Rebase and fix comments.

Rebase and address feedback

Move UpdateFlags items into CChainState, rebase, and address other minor nit.

Remove GlobalState errorenous comment.

Rebase

Rebase

Rebase and use rwcollection

Remove clang-format issue

Rebase on master

Another way this script can be improved is to only run if the previous run has a different HEAD commit than latest master, though this feature isn't strictly necessary for MVP.

@jasonbcox Are your backports done? If not, this is a very small change to rebase onto.

Rebase on updated D2172

Delete yet another vestige

Fix median calculation

Remove an extraneous whitespace

Rebase

Remove last vestigates of block policy estimator

Clean up some unnecessary globals

Include change to docs

Remove test_framework dependency on silly file

Remove writing/reading of fee stats.

Rebase

Update

Clean up some formatting issues