[MERGE] tree.changes_from and status allow kind changes

[Aaron Bentley]

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Hi all,

This patch adjusts tree.changes_from and TreeDelta to permit file kind
changes.

Kind changes are displayed as
- ---
kind change:
 filename (file => directory)
- --
Or "K  filename (file => directory)" in the short format.

Files that have kind changes and are also renamed are treated as
modified and renamed, which is also true.  Updating the TreeDelta
structure to include kind changes in the rename list would break API
compatibility.

I expect to have a follow-on patch which replaces the short-format
output with the revert-style short output, and this will faithfully
represent rename-with-kind-change.

Aaron
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