let pool page allocators advertise what sizes they can provide.

to keep things concise i let the multi page allocators provide
multiple sizes of pages, but this feature was implicit inside
pool_init and only usable if the caller of pool_init did not specify
a page allocator.

callers of pool_init can now suplly a page allocator that provides
multiple page sizes. pool_init will try to fit 8 items onto a page
still, but will scale its page size down until it fits into what
the allocator provides.

supported page sizes are specified as a bit field in the pa_pagesz
member of a pool_allocator. setting the low bit in that word indicates
that the pages can be aligned to their size.

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