Merge branch 'jn/setup-fixes'

* jn/setup-fixes:
  t1510: fix typo in the comment of a test
  Documentation updates for 'GIT_WORK_TREE without GIT_DIR' historical usecase
  Subject: setup: officially support --work-tree without --git-dir
  tests: compress the setup tests
  tests: cosmetic improvements to the repo-setup test
  t/README: hint about using $(pwd) rather than $PWD in tests
  Fix expected values of setup tests on Windows