mailinfo and applymbox updates
This attempts to minimally cope with a subset of MIME "features" often
seen in patches sent to our mailing lists. Namely:
- People's name spelled in characters outside ASCII (both on From:
header and the signed-off-by line).
- Content-transfer-encoding using quoted-printable (both in
multipart and non-multipart messages).
These MIME features are detected and decoded by "git mailinfo".
Optionally, with the '-u' flag, the output to .info and .msg is
transliterated from its original chaset to utf-8. This is to
encourage people to use utf8 in their commit messages for
interoperability.
Applymbox accepts additional flag '-u' which is passed to mailinfo.
Signed-off-by: Junio C Hamano / 濱野 純 <junkio@cox.net>