Importing more testing materials from THW

Importing more testing materials from THW

W. Trevor King: After hunting around for the source of the original
55bb6b2, I built this merge with:

  $ echo 55bb6b2882f32ecf9fb5bf9ff7c6258afd116522 \
  >   8d0def440ded7b9d5ee98500afd680fccc00d4a0 \
  >   3f530de51871e113922b96f87b668de4dc544cd6 \
  >   b22b30ba4415da04819e60cc20a4ff916307c9d9 > .git/info/grafts
  $ git checkout -b test-bc-thw 55bb6b2882f32ecf9fb5bf9ff7c6258afd116522
  $ git filter-branch
  $ rm .git/info/grafts

Then I removed the files we didn't want from 55bb6b2, with special
handling to avoid the shell-sensitive quote in
lessons/thw-python-debugging/conways_game_of_life/Conway's.

  $ git rm -rf lessons/thw-python-debugging/
  $ git rm -rf --ignore-unmatch $(git ls-tree -r --name-only HEAD | grep -v thw-testing)

Squash that into the original merge:

  $ git commit -a --amend

Did we miss anything?

  $ HASH=$(git rev-parse --short HEAD)
  $ for FILE in $(git ls-tree -r --name-only HEAD); do
  >   git blame -- "$FILE" | grep "$HASH";
  > done

Nope.