[MERGE] Minor tree and dirstate code cleanups

[Ian Clatworthy]

I'm currently pouring over the dirstate and tree code getting my head
around what's done where and why. Here's the first batch of minor code
cleanups I'd like to see.

Most of the changes are comment fixes. I didn't just merge this because
some other minor changes are proposed as well. I don't think this is
NEWS worthy though.

Ian C.
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