[MERGE] 4% faster to incremental commit

[Ian Clatworthy]

Robert Collins wrote:
> This is the tweaked patch, with a bug in bzr.dev for pointless commits
> of nested trees fix (Ian's questions about whether my code had a bug had
> me look for this, and it was broken in bzr.dev).

Sweet. Thanks for the bug fix while you were in there.

bb:tweak

If you agree with them, I'll make the tweaks as I merge.

>          self.bound_branch = None
> +        self.entries_changed = False
> +        self.entries_deleted = False

Poolie's suggestion re naming these any_entries_* needs to be applied.

>      # all clients should supply tree roots.
>      record_root_entry = True
> +    # the default CommitBuilder does not manage trees whose root is versioned.
> +    _versioned_root = False
[snip]
>  class RootCommitBuilder(CommitBuilder):
>      """This commitbuilder actually records the root id"""
>      
> +    # the root entry gets versioned properly by this builder.
> +    _versioned_root = False
> +

I believe you meant True here for the RootCommitBuilder case, yes?

Ian C.