blame: add --abbrev command line option and make it honor core.abbrev
If user sets config.abbrev option, use it as if --abbrev was given. This is the default value and user can override different abbrev length by specifying the --abbrev=N command line option. Signed-off-by: NNamhyung Kim <namhyung@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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