help: implement multi-valued "man.viewer" config option
This allows multiple viewer candidates to be listed in the configuration file, like this: [man] viewer = woman viewer = konqueror viewer = man The candidates are tried in the order listed in the configuration file, and the first suitable one (e.g. konqueror cannot be used outside windowed environment) is used. Signed-off-by: NChristian Couder <chriscool@tuxfamily.org> Tested-by: NXavier Maillard <xma@gnu.org> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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