Merge branch 'maint-1.5.1' into maint

* maint-1.5.1:
  git-config: Improve documentation of git-config file handling
  git-config: Various small fixes to asciidoc documentation
  decode_85(): fix missing return.
  fix signed range problems with hex conversions

diff --cc cache.h
Simple merge

diff --cc sha1_file.c
Simple merge