[v3] Don't declare insert(&&) members in _Hashtable

[Paolo Carlini]

Hi,

noticed while working on finally defaulting pair' move constructor (the 
way to go, proposed by Daniel, seems to be using 
std::is_constructible<value_type, P&&> instead of std::is_convertible 
for constraining. Testing that uncovered a number of interesting latent 
issues at various levels ;)

Tested x86_64-linux, committed.

Paolo.

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