[RFC] Introduce kind change support

[Aaron Bentley]

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Ben Finney wrote:
> Howdy all,
> 
> [Please reply only to the discussion forum, I subscribe via NNTP.]
> 
> I keep the /etc of a few machines under VCS control. I'm trying to
> convert one from bazaar 1.x to bazaar 2.

I've established that this assertion is triggered by changing a symlink
to a plain file.

Bazaar does not officially support changing the kind of a file, but many
people think it would be a good idea, and it's required to support
import from all Baz archives.

So here's a patch that implements it for "commit".  Unfortunately, we
have many different codepaths for comparing files, so "status" will
still raise an exception.

1. Do we want to do this?
2. Can we unify our tree-comparison functionality across status, revert
and commit?

Aaron
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