[Patch] First bits of the algo merge

[Paolo Carlini]

Paolo Carlini wrote:

>I'm finishing testing (already past 25_algorithms) the below in
>v7-branch (mainline compiler is currently broken, anyway).
>  
>
I like the below version slightly better: the template parameters of
__ops::bind2nd and its helpers are now much more readable.

Also, double checked the concept checks, now seem right to me,
consistent with the actual operations carried out and the predicated
counterparts.

Tested x86-linux.

Paolo.

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