bzrtools now does ancestry graphs

[Aaron Bentley]

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Hi all,
I've hacked up a new graph-ancestry command that draws graphs of the
revision history.

Sample output for the bzr mainline is here:
http://www.aaronbentley.com/graphics/ancestry.png

This is a collapsed graph; all straight-line nodes are removed.  Only
nodes with multiple parents or multiple children are kept.

Yellow nodes are the revision-history nodes.  Dotted lines mean these
nodes are listed, but not found in the branch storage.

Aaron
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