[MERGE] BranchBuilder updates

[John Arbash Meinel]

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John Arbash Meinel wrote:
| For my merge work, I was realizing that I'm going to need to be creating
| a lot of different histories, including weird branching and merging, and
| per-file changes.
|
| I was hoping to do it with in-memory trees, but our current APIs are a
| bit lacking.
|
| So with this, I'm adding new functionality to BranchBuilder, which will
| let us build lots of nice history without actually having to hit disk.
|
| I'd like to get some tests switched over to using it, just to show how
| it works. But the basic idea is that you describe the changes as a list
| of 'actions' for each commit.
|
| The one thing it doesn't support is "merge" because our merge code
| depends on having a real disk backing the WorkingTree. It also doesn't
| support "rename" yet, because MemoryTree doesn't.
|
| At the moment, I'm calling the nice function "build_snapshot".
| "build_commit" was already taken (to create a simple linear commit
| without anything very interesting). I certainly could just replace the
| "build_commit" function if we prefer. It isn't a public-for-plugins sort
| of thing, it has been meant for testing, where we have been less strict
| about compatibility.
|
| Feedback is very welcome, as I plan on using this "in anger" soon.
|
| John
| =:->

Attached is a small update. I went ahead and used it in a test, and it
exposed that while we don't *need* it, some tests would like control
over the commit message.

So we have the ability to supply a message if we want to, and we have a
Branch test using the builder.

John
=:->
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