[patch] : Add operator=(pair) to tr1::tuple

[chris jefferson]

This patch adds an operator=(std::pair) to tr1::tuple, which is
specified in TR1 but was previously missing. The most obvious problem
this causes (and how I noticed it) is that you can't use tr1::tie with
std::pairs without it.

Also inlines a few functions which often optimise away to no code when
inlined.

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