Merge branch 'js/format-2047'

Fixes many rfc2047 quoting issues in the output from format-patch. * js/format-2047: format-patch tests: check quoting/encoding in To: and Cc: headers format-patch: fix rfc2047 address encoding with respect to rfc822 specials format-patch: make rfc2047 encoding more strict format-patch: introduce helper function last_line_length() format-patch: do not wrap rfc2047 encoded headers too late format-patch: do not wrap non-rfc2047 headers too early utf8: fix off-by-one wrapping of text