lazymanifest: use a binary search to do an insertion
This makes insertions log(n) plus some memmove() overhead, rather than
doing an append followed by an n*log(n) sort. There's probably a lot
of performance to be gained by adding a batch-add method, which could
be smarter about the memmove()s performed.
Includes a couple of extra tests that should help prevent bugs.
Thanks to Martin for some significant pre-mail cleanup of this change.
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