Merge branch 'jc/format-patch-name-max'

The maximum length of output filenames "git format-patch" creates
has become configurable (used to be capped at 64).

* jc/format-patch-name-max:
  format-patch: make output filename configurable

diff --cc Documentation/config/format.txt
Simple merge

diff --cc Documentation/git-format-patch.txt
Simple merge

diff --cc builtin/log.c
Simple merge

diff --cc t/t4014-format-patch.sh
Simple merge