[patch] : so_7 search improvement take 2

[chris jefferson]

OK, here is another attempt.

Mainly because of the problem with unions (which I think won't be 
solvable until when/if tr1::is_union appears), I've decided to scale 
back. Now I have only specialised __bind2nd (a internal special version 
of bind2nd) for __gnu_cxx::__ops::equal_to, which means that we aren't 
penalising people who don't give a predicate.

The patch to std::search and the testsuite remains identical.

Chris
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