KProcess: writeStdin API braindamage

[Waldo Bastian]

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Hi,

Now that KProcess creates non-blocking pipes to its child processes it becomes 
clear that the semantics of the writeStdin function are brain dead: hardly 
any caller makes sure that the data that was passed stays alive long enough 
(t.i. till a wroteStdin signal arrives)

This patches corrects that, by making a local copy of the data if the data 
could not be directly written into the pipe. This fixes pasting large amounts 
of data into konsole.

Please review.

Cheers,
Waldo
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