[MERGE] Shelf 1 / 5: TreeTransform serialization

[Aaron Bentley]

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Hi all,

This patch implements TreeTransform serialization so that we can
reconstruct a preview tree for unshelving purposes.

A serialized TreeTransform is similar to a changeset, which is a staple
of other VCSes.  However, a serialized TreeTransform can refer to
unversioned, as well as versioned files.  This could for the basis of an
undo command in the future.

Serialization uses single-parent mpdiffs for delta compression, packs
for record separation, bencode for metadata storage.  It's all
suspiciously like bundle format 4.

Aaron
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