Remove algo duplication

[François Dumont]

Hi

     I still have this patch pending on my side, I don't think we ever 
really decided what to do with it. In this version of the patch 
everything not Standard has been moved to the std::__detail namespace 
for a cleaner design.

Could it go in trunk ?
If so, now or after creation of 4.9 branch ?
If not, should I create a branch to keep it waiting for I don't know why ?
Should I simply forget it ?

Note that it has been tested under Linux x86_64 normal and debug modes.

François

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