[v3] Adjust shared_ptr signatures vs the allocator parameter

[Paolo Carlini]

Hi,

the below tries to adjust the signatures wrt the by value vs by const
lvalue ref allocator parameter mess. I tried to keep it minimal, thus
only making sure that: 1- All the std::shared_ptr signatures are per
N3225; 2- Consistently the same is true for __shared_ptr; 3- Minimally
optimize the former constructors to use std::move in the initializers
involving the latter. Jon, does the patch look sane to you?

Tested x86_64-linux.

Paolo.

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