Making "appdata" work without KApplication

[David Faure]

KGlobal::dirs()->saveLocation("appdata") doesn't work when using only KInstance
(and maybe QApplication) in a process - like qtestlib unit tests do.

The attached patch fixes it, by moving the appdata resource creation to a method
that is run when the very first KInstance is created (which becomes KGlobal::instance(), nothing new there).
Any objections?

In fact I think many initialization things in KApplication could move to that new
KGlobal::setMainInstance() private method.
The code that calls QApplication::addLibraryPath() [static] with the paths from the qtplugins resource, for instance.
Any non-GUI initialization, in fact [unless it requires a [QK]Application).

-- 
David Faure, faure at kde.org, sponsored by Trolltech to work on KDE,
Konqueror (http://www.konqueror.org), and KOffice (http://www.koffice.org).
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