2021 week 26: rebase off upstream

[adpaco-aws]

No description provided.

[adpaco-aws]

While rebasing we get a conflict with one of the issue templates: .github/ISSUE_TEMPLATE/library_tracking_issue.md
Action taken: Remove that file.

Then we get another conflict in src/tools/compiletest/src/header.rs, where a call to iter_header uses different arguments (we edited this function in #168). Action taken: Replace old call with new one.

[adpaco-aws]

The previous action did not work. It seems like this commit has changed the way in which tests are marked as "ignored" (this was done in the from_reader impl. of EarlyProps) so I will have to figure out the best way to do this for RMC.

[adpaco-aws]

Tried again.

This time, I have accepted the changes in the from_reader impl. of EarlyProps. This removed a change we made in #168 that marked tests as "to-ignore" based on their name. I added an equivalent change in that same commit. Then continued the rebase without any more problems.

[adpaco-aws]

The regression completes successfully. Candidate branch is main-153-2021-07-02.