[MERGE/0.91/data-loss] Subtree references not fetching correctly

[Robert Collins]

There was a bug in the fileids_altered_by regex when subtree references
were in the revisions being pulled. The cause was that in a line 
...revision=...reference_revision=...

The latter reversion=... content was being matched - I've fixed this by
adding a ' ' before the revision= part of the regex. The test I've added
catches this and errors without the regex change being made. 

Finally I changed the format used for testing InterSameDataRepository to
cause subtrees to be enabled in this test.

This is a data-loss causing bug, if someone branches a repository and
then deletes the source, they will have to manually reconstruct the
missing weave.

Cheers,
Rob


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