[v3] Use noexcept in char_traits, typeindex, more work on pair and tuple

[Paolo Carlini]

Hi,

more or less straightforward work (*), <tuple> bits enabled by Jason' 
fix for c++/49082 (thanks again!). Tested x86_64-linux, committed.

Thanks,
Paolo.

(*) Modulo the long standing issue we have with pair' move constructor 
vs std::map: we can't provide it defaulted per the letter of the FDIS. A 
tricky issue we have yet to fully analyze with Jason and Daniel (and all 
the interested parties). Probably it's time...

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