[MERGE] fix 'bzr missing -v'

[John Arbash Meinel]

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indigo on IRC pointed out that supplying --verbose to 'bzr missing' was
printing out backwards deltas.

Basically it was doing:
  parent_tree.changes_from(child_tree)

rather than:
  child_tree.changes_from(parent_tree)

This patch fixes it so we do the right thing, and adds a test for
iter_log_data() to make sure that there aren't any other subtle problems
(like getting renames backwards, etc).

I probably went a little overboard on the test, but I think it makes
sure we cover all the cases of deltas.

John
=:->
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