[MERGE] Minor tree and dirstate code cleanups

[Robert Collins]

On Fri, 2007-09-14 at 12:29 +1000, Ian Clatworthy wrote:
> Robert Collins wrote:
> 
> >> I'm happy to back that bit out btw - just explaining why I changed it.
> > 
> > if <string>: is 6 times faster than if len(string) > 0.
> > 
> > When the failure mode is safe, 'if thing' is very efficient.
> 
> OK. Backed out.
> 
> Changed N -> 3 as well as discussed.

good to go then.

bb:approve
-Rob
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