[MERGE] annotate.py code cleanups

[Ian Clatworthy]

I'm currently looking at how annotations will work and perform with
packs. Some minor cleanups to annotate.py to get the ball rolling.

BTW, it looks like workingtree.py has all the code necessary to annotate
an edited file and show uncommitted changes as "current:". The annotate
command however ignores this capability and always annotates a committed
revision tree - the last committed one by default. Is that a historical
thing or something we want by design?

Ian C.
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