[PATCH 0/7] nd/setup fixups

This replaces the last three patches in nd/setup in pu (from clean up setup_discovered_git_dir to t1020-subdirectory)

Changes are:

 - Retain old behavior of setup_discovered_git_dir() when .git is not
   explicitly set by set_git_dir(), but later on by setup_git_env().
   This helps remove the ugly workaround in set_git_dir() earlier.

 - Include t0001 tests from Jonathan. You'll see I sneak more patches
   in from my old nd/setup from time to time, until I push all of them :)

 - set_git_work_tree() now allows multiple calls as long as the new
   worktree and the old one is the same, as Junio suggested.

 - Document update. Turns out not much is needed.

Jonathan Nieder (1):
  t0001: test git init when run via an alias

Michael J Gruber (1):
  t1020-subdirectory: test alias expansion in a subdirectory

Nguyễn Thái Ngọc Duy (5):
  setup: clean up setup_discovered_git_dir()
  setup: rework setup_explicit_git_dir()
  Remove all logic from get_git_work_tree()
  Revert "Documentation: always respect core.worktree if set"
  git.txt: correct where --work-tree path is relative to

 Documentation/config.txt |   23 ++---
 Documentation/git.txt    |    2 +-
 builtin/init-db.c        |   14 ++-
 cache.h                  |    1 -
 environment.c            |   32 ++----
 setup.c                  |  208 +++++++++++++++++--------------
 t/t0001-init.sh          |   56 +++++++++
 t/t1020-subdirectory.sh  |    8 ++
 t/t1510-repo-setup.sh    |  310 +++++++++++++++++++++++-----------------------
 9 files changed, 360 insertions(+), 294 deletions(-)