Pools rewrite [2]

[Sander Striker]

Hi,

This is my second go at the pools code.
I incorporated some suggestions made by Brian Pane.

Please review,

Sander

PS. The debug code will come back, but in a different
    incarnation.  I need some time to do that without
    making the code unreadable.

apr_pools.c
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apr_pools.h
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