Updates for faster local branching

[Aaron Bentley]

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The inability to append more than one revision to the revision history
at a time makes local branching slower than it needs to be.

append_multiple.patch makes append_revision take any number of revision
parameters.

update_revisions_fast.patch invokes append_revision once with a list,
instead of once per entry in the list.

I ran three tests of before and after these patches were applied.
The tests consisted of running "rm -R bzr.test; time bzr.dev/bzr branch
bzr.mpool bzr.test"

The best times were:

before:
real    0m43.714s
user    0m35.798s
sys     0m5.656s

after:
real    0m34.970s
user    0m29.296s
sys     0m4.379s

You'll note that in the 'before' times, bzr appears to spend ~3 seconds
waiting on I/O.  This is reduced to ~1 second.

Aaron
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