status: add --[no-]ahead-behind to status and commit for V2 format.
Teach "git status" and "git commit" to accept "--no-ahead-behind" and "--ahead-behind" arguments to request quick or full ahead/behind reporting. When "--no-ahead-behind" is given, the existing porcelain V2 line "branch.ab +x -y" is replaced with a new "branch.ab +? -?" line. This indicates that the branch and its upstream are or are not equal without the expense of computing the full ahead/behind values. Signed-off-by: NJeff Hostetler <jeffhost@microsoft.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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