This implements a mass-copy command that takes a sequence of lines in
the format
<from-sha1> SP <to-sha1> [ SP <rest> ] LF
on stdin, and copies each <from-sha1>'s notes to the <to-sha1>. The
<rest> is ignored. The intent, of course, is that this can read the
same input that the 'post-rewrite' hook gets.
The copy_note() function is exposed for everyone's and in particular
the next commit's use.
Signed-off-by: Thomas Rast <trast@student.ethz.ch> Acked-by: Johan Herland <johan@herland.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>