[patch] : more delegation in stl_algo.h

[Chris Jefferson]

For those interested, the reason why I couldn't use the existing bind2nd 
is that it assumes you inherit from binary_function or at least define 
various typedefs. We I think shouldn't start assuming now user code does 
this, and also such things aren't compatable with clever templated 
operator()s , like we already added!

Apart from that, this patch is hopefully mostly fairly obvious, with the 
exception that replace_copy of used to have a construct "z = p ? x : y" 
which I've replaced with "if(z) p=x else p=y", as in theory x and y can 
be of different types, neither convertable to the other but both 
convertable to typeof(z).

Previously mentioned optimisations to search and search_n will follow 
shortly once I can figure out why they don't seem to be working :)

Chris
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