[MERGE] make knit joins reannotate-less

[Robert Collins]

This patch alters knit to store full text revision ids within a content
record allowing gzipless joining - no reannotation in the common case -
which gives a 50% reduction in time, for a 5% increase in disk size.


Seeking +1

Rob
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GPG key available at: <http://www.robertcollins.net/keys.txt>.
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