[Patch] Final algo patch for v7-branch

[Paolo Carlini]

Howard Hinnant wrote:

> Can you double check this one?

No that is right, in fact I checked it yesterday, __bind2nd takes <_Lhs,
_Value, __gnu_cxx::__ops::equal_to<_Lhs, _Value> >, a total of three
paramters.

Well, there is a different error, caused by my last minute change of
yesterday evening, when I swapped some parameters for clarity, but in
the specialization, not in the instantiation. I'm fixing it now while
doing a merge mainline -> v7.

Thanks,
Paolo.