[MERGE][bug #232188] Simple update to annotate

[Robert Collins]

Robert Collins has voted approve.
Status is now: Approved
Comment:
One thing we could do to prepare for more informative annotations is to 
assign a listof revids to a line, rather than a revid to a line.

For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3C488F4CF7.8000203%40arbash-meinel.com%3E
Project: Bazaar