Merge tag 'upstream/0.19.0'

Merge tag 'upstream/0.19.0'

* tag 'upstream/0.19.0': (384 commits)
  libgit2 v0.19.0 "gut merge"
  test-rename: This is not a decimal, silly
  Fix a leak in the local transport code.
  Fix checkout tests on Windows
  Work around reparse point stat issues
  Fixed most documentation header bugs
  Add O_CLOEXEC to open calls
  Constrain mkdir calls to avoid extra mkdirs
  Do not redefine WC_ERR_INVALID_CHARS
  Addition checkout target directory tests
  Loosen ensure_not_bare rules in checkout
  Add target directory to checkout
  Fix checkout of modified file when missing from wd
  test asserting checkout should not recreate deleted files
  Add test for fixed diff bug
  Fix comment and copyright in example
  Add example implementation of long format status
  Add status flags to force output sort order
  Initial implementation of status example
  Fix bug in diff untracked dir scan
  ...