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git-diff --numstat -z: make it machine readable
The "-z" format is all about machine parsability, but showing renamed
paths as "common/{a => b}/suffix" makes it impossible. The scripts would
never have successfully parsed "--numstat -z -M" in the old format.
This fixes the output format in a (hopefully minimally) backward
incompatible way.
* The output without -z is not changed. This has given a good way for
humans to view added and deleted lines separately, and showing the
path in combined, shorter way would preserve readability.
* The output with -z is unchanged for paths that do not involve renames.
Existing scripts that do not pass -M/-C are not affected at all.
* The output with -z for a renamed path is shown in a format that can
easily be distinguished from an unrenamed path.
This is based on Jakub Narebski's patch. Bugs and documentation typos
are mine.
Signed-off-by: Junio C Hamano <gitster@pobox.com>