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
Merge topic 'gdal-add-feature-ids' into master

35c403a6 Add option to GDAL reader to output feature IDs.