[PATCH v4 0/3] use mailmap by default in git log

It is not uncommon for people to change their name or e-mail address. To facilitate this, Git provides support for the `.mailmap` file, which contains a list of identities and previously used e-mail addresses that are associated with that identity.

Unfortunately, while Git's support for the `.mailmap` file is generally excellent, I recently discovered that `git log` does not treat the mail map file the same as the other tools, instead requiring an explicit flag to use the mailmap file.

I believe this is an unfortunate flaw, as the mailmap file should ideally contain the most current known contact information for a contributor, allowing anyone to contact the contributor about their patches in the future.

This should be the finished version of the patch set, thanks to everyone who has helped review it!

New in version 4:
- Remove reundant `--no-use-mailmap` option, the option parsing
  code automatically handles negation.
- Update config/log.txt documentation to reflect the new default.

New in version 3:
- Rework many mailmap tests to drop redundant `--use-mailmap` and
  more rigorously test --no-use-mailmap and configuration variants.
- Typo fixes in the commit messages.

New in version 2:
- The `--no-use-mailmap` option, which complements `--use-mailmap`.
- Tests for `--no-use-mailmap`.

Ariadne Conill (3):
  log: use mailmap by default
  log: document --no-use-mailmap option
  tests: rework mailmap tests for git log

 Documentation/config/log.txt |  4 +--
 Documentation/git-log.txt    |  2 +-
 builtin/log.c                |  2 +-
 t/t4203-mailmap.sh           | 49 ++++++++++++++++++++++++++++++------
 4 files changed, 45 insertions(+), 12 deletions(-)