Vendor branch in svk

Your project requires Acme-Colour

% tar xfz Acme-Colour-1.00.tar.gz -C /tmp
% svk import -m "import 1.00" //vendor/acme-colour /tmp/Acme-Colour-1.00
% svk cp -m "take acme-colour 1.00" //vendor/acme-colour //project/src/acme-colour

% svk co //project
# hack hack hack

You make some local modification to src/acme-colour

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