Backward compatibility with ExtractGroup/ExtractDataSet filters
This issue was created automatically from an original Mantis Issue. Further discussion may take place here.
ExtractGroup filter is no longer available, while ExtractDataSet filter used to work on all composite datasets now only works on HierarchicalBoxDataSet (we use ExtractBlock for multiblock datasets).
This may not be possible to do using the simple xml conversion since without knowing the actual data type we cannot choose the filter to create and without knowing the composite dataset structure, we cannot determine the flat-index needed by ExtractBlock filter.
Solution may be to create a python program that takes and input state and dumps out a converted state with XMLs for all possible choices and comments to the user to edit it to create the correct filter and set the composite index correctly.