[MERGE] InterCHKRevisionTree (brisbane)

[Ian Clatworthy]

This patch adds a fast path for iter_changes between
two RevisionTrees in a CHK repository. The code was
written by Vincent and needs a review by someone more
familiar than I am in this area.

Giving it a quick look, the embedded not_a_change()
function is never used and can be removed. Or perhaps
it needs to be used and the code doesn't do that yet?

Ian C.
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