[Development] fixing name of QNetworkAccessManager::createRequest

[Peter Kuemmel]

> 
> Well, having method createX which creates Y doesn't sound good to me
> either.
> 

Yes, this is worse than a binary-only bug.

I don't know the policy for API changes for Qt 5.0, 
but when such a thing couldn't be fixed, nothing else
is worth braking source code compatibility.

I would fix it because it is super simple to create
a script which simply replaces all the relevant strings
in the source files.

Peter
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