Add option to GDAL reader to output feature IDs.

If requested, pedigree IDs are added to each polydata
leaf in the output multiblock dataset; these IDs relate
each cell to its generating OGR feature.

Change-Id: I6990c606167c2bbe8435dc0175dc71446e36b74a
Add double-click picking inside JoglConeRendering sample code

On top of the widgets we also add a picking action on a double click action.

Change-Id: I7631e1541491edd41d49e4f1dfc53ec415a6a2d6
Merge topic 'gdal-add-feature-ids' into master

35c403a6 Add option to GDAL reader to output feature IDs.
Merge topic 'vtk-java-add-picking-example' into master

2a91342e Add double-click picking inside JoglConeRendering sample code