Using this option, users can upload XML files coding Filters. This files are
usually generated in the Export Filters section.
By default, when you import a XML file into a Study where Filters already
exist, the new structure will be added to the old one.
The option "Remove existing filters and subsets" will substitute the old Filters structure with the new one.
The option "Create needed descriptors" will add new descriptors to the Study if the Filter structure imported makes reference to descriptors that do