[MERGE/RFC] log refactoring

[Ian Clatworthy]

This patch refactors the implementation of log so
that --short logging iterates most of the time,
rather than being O(history) as often as it currently is.

I'm yet to measure the performance gains, if any.
I'll do that soon. As long as performance is as
least as good as it currently is, I think this is
a win in term of clearer code anyhow.

A separate patch is coming to make --short logging
the default.

Ian C.
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