When specifying --in-reply-to for a message M, have
[M]
[0/2]
[1/2]
[2/2]
instead of
[M]
[0/2]
[1/2]
[2/2]
which is more consistent with the way messages are being threaded
when --in-reply-to is not used.
RfC2822 mandates a line length limit of 998 byte + CRLF.
Python mail tools break lines at 990 byte. To prevent
that, we quoted-printable encode overly long lines.
Implemented as two functions: diffstat, which yields lines of text,
formatted as a usual diffstat output, and diffstatdata, which is called
inside diffstat to do real performing and yield file names with
appropriate data (numbers of added and removed lines).
Non-GNU versions of the sed(1) utility (i.e. on Solaris or BSD)
may not support extended regexps (i.e. including \| branches),
or may need a special option to enable it (like -E instead of -e).
Expand the sed RE in tests/test-patchbomb to fix running this
test on FreeBSD and Solaris.