[MERGE REQUEST] fix fetch when revision

[Aaron Bentley]

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So the recent WeaveError bugs triggered by merging hmeland's branch
appear to be caused by Fetcher not being careful enough.  It makes two
incorrect assumptions

1. If a revision requires a previously-unseen text, the revision ID of
that text will be the same as the revision's own ID
2. If a revision in a branch requires a text, that text will be present
in the branch.

The first assumption is violated by ghosts.  Revision X, which is a
descendant of revision Y, may require a text with revision-id Y even if
Y is a ghost.

The second assumption is violated by corrupt branches.

This patch deals with both by querying the weave directly for each
required revision.

If a text revision is missing from the local weave, we attempt to apply
new revisions from the remote weave.  If the remote weave doesn't have
that text revision (e.g. it's corrupt), we throw an exception, to
prevent the local branch from becoming corrupt.

You can merge it from bzr.ab

Aaron
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