Merge branch 'qq/maint' (early part) into maint

* 'qq/maint' (early part):
  git-svn.perl: workaround assertions in svn library 1.5.0
  mailinfo: feed the correct line length to decode_transfer_encoding()
  git-clone: remove leftover debugging fprintf().
  Fix "config_error_nonbool" used with value instead of key
  clone -q: honor "quiet" option over native transports.
  attribute documentation: keep EXAMPLE at end
  builtin-commit.c: Use 'git_config_string' to get 'commit.template'
  http.c: Use 'git_config_string' to clean up SSL config.
  diff.c: Use 'git_config_string' to get 'diff.external'
  convert.c: Use 'git_config_string' to get 'smudge' and 'clean'
  builtin-log.c: Use 'git_config_string' to get 'format.subjectprefix' and 'format.suffix'
  Documentation cvs: Clarify when a bare repository is needed
  Documentation: be precise about which date --pretty uses