usertest results for index2

[Ian Clatworthy]

csv files attached comparing common operations across
3 deep repos - python, mysql 5.1 and OOo:

* bzr = rev 3524
* bzr-btree = rev 3524 + index2 plugin

In the latter case, bzr init --btree-plain; bzr pull
was used instead of bzr branch. See usertest rev 118
for the benchmarking code.

In summary, log one file is much quicker while most
other things are much the same, if slightly slower.
These are fully packed repos though so that's probably
making the current index code look better than it
really is. Even so, we might want to dig a little deeper
on some of these results before making a format with
btree indexes the default.

Ian C.
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