respect GPL V3 usage rules

databrowser-core/LICENSE

.../org/cdma/gui/databrowser/exception/BadFileException.java

.../cdma/gui/databrowser/exception/DataBrowserException.java

...ava/org/cdma/gui/databrowser/exception/LoadException.java

.../cdma/gui/databrowser/impl/AbstractDataSourceBrowser.java

...i/databrowser/impl/AbstractDataSourceProducerBrowser.java

...ma/gui/databrowser/impl/AbstractFileDataSourceSeeker.java

.../java/org/cdma/gui/databrowser/impl/DataSourceSeeker.java

...in/java/org/cdma/gui/databrowser/interfaces/AxisType.java

.../java/org/cdma/gui/databrowser/interfaces/DataFormat.java

...in/java/org/cdma/gui/databrowser/interfaces/DataType.java

.../cdma/gui/databrowser/interfaces/IAbstractController.java

...g/cdma/gui/databrowser/interfaces/IDataSourceBrowser.java

...rg/cdma/gui/databrowser/interfaces/IDataSourceSeeker.java

...java/org/cdma/gui/databrowser/interfaces/IItemViewer.java

...cdma/gui/databrowser/interfaces/IPlayerPanelListener.java

...c/main/java/org/cdma/gui/databrowser/interfaces/Item.java

...n/java/org/cdma/gui/databrowser/util/ApplicationUtil.java

...ava/org/cdma/gui/databrowser/view/tree/GroupTreeNode.java

...java/org/cdma/gui/databrowser/view/tree/ItemTreeNode.java