Qt can't write every image file format that it can read. Deal with it in MapWizard:
Qt can't write every image file format that it can read. Deal with it in MapWizard:

* always create preview icons in png format (and scale them to 136x136)
* store the raw image data of the base tile as it was retrieved from the server and test it with QImage

svn path=/trunk/KDE/kdeedu/marble/; revision=1211288

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