[merge] bzr missing replacement

[Aaron Bentley]

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Please merge from http://panoramicfeedback.com/opensource/bzr.ab

This contains a replacement for the merge command, based on work by
Daniel Silverstone.

The essential difference between it and the old --missing is that it
treats merged revisions as 'not missing', while the original treated any
revision not in the revision-history as 'missing', even if merged.

Additionally, it is bidirectional, so it will report on locally-present
revisions that are missing from the other branch.

It supports every option from the old 'missing' command.  It also has
the questionable behavior of setting the branch parent if unset, just
like the original.

Additionally, it supports multiple log formats, shows logs in
newest-to-oldest order, and can make you breakfast in bed.

Note that this is the only change currently present in bzr.ab.  I have
undone the merge fix that had no testcase.

Aaron
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