[v3] extern/fixed-memory/archive allocator

[Benjamin Kosnik]

I'm planning on using this in place of the current strategy for
allocating global objects. Seems to work well in preliminary tests, but
I post this for more comments.

This is just a way of taking existing storage and fitting it in to the
std::allocator model so that STL, string, etc can use it. It can be thought of 

http://gcc.gnu.org/ml/libstdc++/2003-01/msg00103.html

crossed with src/global*.cc

Actually I'd like to experiment with pre-allocating space for pools in
mt_alloc with this. But, that's a later patch.

tested x86/linux

-benjamin
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