Let kquitapp fail verbosely

[Stefan Monov]

Hi.
Currently, when kquitapp fails to do its job, it says nothing, which
can be confusing. Attached is a patch that makes it output an error
message instead (modeled after killall's).
I was unsure whether to use fputs, fprintf, cerr or kDebug() (all of
those are used throughout KDE), so I picked what's nicest - cerr. ;)
Also I'm unsure whether the toLocal8bit conversion is needed.
Can I commit?

Stefan
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