Redesign of the wmem block allocator.

What was becoming apparent as more dissectors started using wmem was that the
old block allocator design had issues with memory fragmentation. This keeps the
same underlying memory layout, but completely changes how free blocks are kept.
It runs about 3% slower in my tests (still an order of magnitude faster than
g_malloc) but uses about 1/3 the memory.

I suspect some simple optimizations could reclaim that 3% as well - the design
is fast, but I did not code particularly for speed.

Thoroughly tested with the existing test suite (which caught half a dozen bugs
in my first draft) so it should actually work!

svn path=/trunk/; revision=50955

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