[rfc][icedtea-web] fix for RH947647, following the XDG basedir specification

[Jiri Vanek]

https://bugzilla.redhat.com/show_bug.cgi?id=947647

Hi!

This fix is migrating us to  ?/.config/icedtea-web and ?/.cache/icedtea-web instead of ~/.icedtea.


IO have already tested this a bit, and looks ok. Under normal circumstances the migration should be 
painless, I'm thinking about recursive copy in case that  ~/.config .cache/icedtea-web will already 
exist, as as it is now, the user will see the moving error for ethernity (until he remove old ~/.icedta)


After the flame on irc after "voting" I'm sure the mooving is good thing to do. And everywhere.

Best regards,
   J.
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