[MERGE] Make bzr log FILE faster by looking up text_keys one at a time.

[Gary van der Merwe]

Hi

I stumbled on the fact that by looking up text indexes one at a time
is much faster than looking up a bunch of them. By doing this, we can
make bzr log FILE faster.

Tests with --ls-prof showed a 44% improvement for "bzr log
bzrlib\tree.py >dev/nul"

Gary
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