adding 'using std::flush' to backward/iostream.h

[Gabriel Dos Reis]

Phil Edwards <pedwards@disaster.jaj.com> writes:

| Anybody else think I should do this?  "an_ostream << flush" fails to
| compile when using the backward combatability header; doing this allows
| such code to work.

That must have been a mistake, yes it is OK to have a 

	using std:: <manipulator>;

-- Gaby
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