[MERGE] make 'install_bundles' much cheaper

[John Arbash Meinel]

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So I sorted out the bug with install_bundles.

We had a loop around each revision, which called 'revision_tree()'.
Inside that function, it would call
'_validate_referencese_from_repository'. With the idea that if we have a
revision in a bundle which is already present in the repository, we
should make sure their sha1 sums, etc match.

The bug was that after installing the first revision, suddenly it is in
the repository, so we validate it on the next call. And then again when
installing the *next*, and the next and the next.

It led to obviously bad behavior.

The attached patch just does one simple thing. If we have already
validated all we can with this bundle, don't do it again.

It drops the "install_bundle" times drastically, and without loss of
correctness.


bzr selftest --benchmark Install.\*few_files_small_tree_100_revision

test_few_files_small_tree_100_revision   OK     1354ms/    5720ms
test_few_files_small_tree_100_revision   OK    38071ms/   42625ms

I'll let you figure out which one is with and without the patch.


This patch also adds switches to "pretty" read lock decorators if you
are using '--lsprof-timed', since it makes it much more obvious what
functions are causing overhead.

John
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