[patch] Add move symantics to other containers

[Paolo Carlini]

Paolo Carlini wrote:

>I'm going to apply it to the v7 branch and then do a merge mainline -> v7.
>  
>
Done.

Chris, as a minor issue, I think we should rename the member value of
__is_moveable to __value, for the usual reasons (see, e.g.,
libstdc++/16896). Or I'm missing something and we can avoid this boring
tweak?!?

Paolo.