[MERGE] bzr check detects unreferenced revisions

[Aaron Bentley]

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Hi all,

This patch adds support for detecting unreferenced file versions in "bzr
check".  These are file versions whose version id matches a revision,
but which are not listed as the (last-modified-)revision in the
corresponding inventory entry.

While they may not be referenced by inventories, they are frequently
referenced as build-parents by other file versions, and leaving them out
while fetching would produce a broken repository.  (Early versions of
Bundle 4 did that.  Not pretty.)

Andrew's recent fetch work did not account for this, which is why I
voted resubmit.  But ultimately, we should just fix this bad data, and
detecting it is the first step.

These are revisions that probably ought to be referenced by their
inventories.  I haven't investigated that aspect thoroughly.

This is my output for bzr:

 15566 revisions
 35221 unique file texts
5213198 repeated file texts
vvv
  2450 unreferenced file texts
^^^

  1638 weaves
     2 ghost revisions
     2 revisions missing parents in ancestry
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