Add configuration option for the maximum tile level.
If maximum tile level is not configured, behaviour is like before, that is, the autodetection code is used. For the map themes using this option Marble does not scan the filesystem for tile level directories repeatedly anymore and also pointless HTTP requests for non existing tiles are prevented. Downside of using this option is that new tile levels which might be made available on tile servers will not be used automatically anymore. svn path=/trunk/KDE/kdeedu/marble/; revision=1081980
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