[MERGE] Quick cut at VCS script changeover.

This is most of a changeover of scripts for squid 3 trunk to use bzr;
the missing bit appears to need a bzr 1.1 (to do 'rdiff' basically) or
thereabouts, I'll look into that in a bit. I'm not sure that the
unconverted cvs calls will actually trigger with our current setup or
not.

-Rob

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