'bzr pack' should sync and delete obsolete-packs/*

[John Arbash Meinel]

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I was just thinking about how 'bzr pack' rebuilds all of your pack
files, and creates a new slightly optimized pack file. Which is great,
but it means you instantly bloat your repository by 2x because you have
a copy of everything.

I think it would be reasonable for the last steps of 'bzr pack' to be a
'sync' call to flush everything to disk, and then delete everything in
.bzr/repository/obsolete-packs

Does that seem reasonable?

John
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