brisbane-core changes

[John Arbash Meinel]

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Hey Ian-

I'm happy to see work being done in the brisbane core branch, though I'm
pretty concerned about these changes:

3858 Ian Clatworthy    2009-03-07
     don't check_remap on every unmap call in CHKMap.apply_delta()

3859 Ian Clatworthy    2009-03-07
     only check for remap if changes are interesting in size


I think we want/need to make check_remap() cheaper, but it is the only
thing that ensures the tree stays in 'canonical' form. And I don't think
we can count that 50 bytes is the minimum size, or that 20 byte
reduction will/won't trigger a remap.

If this is just to reduce "deserialise" overhead, adding a cache of
deserialised pages or just making deserialise faster is probably a
better fix.

John
=:->
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