[Patch] My proposal for _Alloc_traits-free rope

[Paolo Carlini]

Hi everyone,

citing Matt:

 "... And if you find it too much of a nuisance, I can just go ahead 
with it."

Indeed, turned out to be a nuisance ;), not only due to the use of 4 
additional
allocators, but also because of many static members in the implementation.

The below is what I have ready, it works (make check + a few simple 
tests from
the SGI STL site), seems to me quite clean, but I'm not sure if it's the 
best
we can do, honestly.

Well, perhaps, 'rope' isn't really used that much these days and we had 
better
spending our time elsewhere...

What do you all think?
Paolo.

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