[PATCH] Add errorList() and errorListWId() to KMessageBox

[Michael Pyne]

Hi all,

Attached is a patch to kdelibs/kdeui/kmessagebox.{h,cpp} that adds support for 
the errorList() and errorListWId() convienience functions to KMessageBox.  I 
would like this support for JuK, as there are a few code paths that process a 
bunch of files sequentially, and each file may have an error.

This is currently handled by either reporting the errors in separate message 
boxes (which is what I'm fixing right now, imagine 50 error message boxes in 
a row!), coercing a QStringList into a QString joined by newlines (this can 
make the end dialog needlessly tall), or by using a different dialog that 
does provide a list (which loses the "Error" property).

The functions are all static, so there should be no problem with binary 
compatibility.

Please let me know if it is alright for me to commit this.

Regards,
 - Michael Pyne
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