[patch] non-blocking messagebox.

[Olivier Goffart]

Often I already has some crash in my application due indirectly to an error 
message, or an information messagebox.

The problem is that calling a dialog with exec() call  
QApplication::enter_loop()  and it this loop, some components can be deleted, 
specialy the class which call the dialog. 

This could be the best way to fix bug like
Bug 63524 and Bug 63127

The patch add an option to the message box to cal QDialog::show() insteads of 
QDialog::exec()  Of course, this is only usefull if this is a simple error or 
information dialog, without exepting results

Opinions?
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