Change 3737

Barrie Slaymaker
Request Review
- Missing / empty data fields other than branch_id no longer affect
  changeset aggregation
    - Needed for VSS, which lacks time information on deletes
- If all revs have change_ids, they are now sorted by change_id
  and name (as opposed to change_id, rev_id)
- VCP::Rev::sort_time() removed
- VCP::Filter::changesets has better debugging
- TestUtils now dumps large diffs
2 edited 0 added 0 deleted
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