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Tidy index.html
Migrate to extjs 3.4.1.1, openlayers 2.13.1 and geoext 1.1. Still a bit out-fashioned, but functional again.
Refactor cube property as a real class that can be instantiated when necessary. Other components will follow in the future to make the app UI more flexible
Build a basic multi-cube support. A cube selector is presented when the application loads, then the real cube app is loaded when a cube has been selected.