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

[Phil Edwards]

> That must have been a mistake, yes it is OK to have a 
> 
>         using std:: <manipulator>;

We just got a PR that other things like std::hex are not made available
through the backward headers.  Should they be added to iostream.h or
iomanip.h?  My inclination is the latter.


Phil

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