[MERGE] filtered-deltas - basis for log DIR

[Ian Clatworthy]

I put up a patch some weeks ago that make log DIR as fast
as I could for pack repositories. Code-wise, it was pretty
ugly though because it changed lots of layers and public APIs
in ways we don't necessarily want to support.

This patch delivers the same functionality in a far less
intrusive way. Of the 3 approaches I originally benchmarked,
this takes the middle approach so it's performance on packs
is moderate. To get great performance though, we'll need
the new chk-based format anyway so I'm more interested in
tuning performance on that format than packs. I'm yet to
tune this for chk repositories but I feel that:

* it's more important to get something working in bzr.dev first

* limiting the API changes as I've done should make it easy to
  do that soon.

Assuming this is now acceptable after review tweaks, I'll put
my "log multiple files and directories" patch back up soon.
Once *that* lands, I'll merge it to brisbane-core and set
about tuning directory logging for chk formats. Well, that's
the plan at least.

Ian C.
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