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Added individual data source items to Data menu.
Moved data hierarchy refresh feature to DataSourceManager item menus.


Change-Id: I338ff153b5d5bf165787ac92fb27c66ddba572e4
LayerListComponent now uses SubMenu for adding a new layer.
Fixed null pointer error in MapTool.isGeomColumnOrRef().

Change-Id: Ic9c24fd6ecd42036e0bece1e1c08225eaffb2a9e