TODO:
  + Cannot be merged as Upgrader requires UI access and without Selections
    it is not really useable...
  + Monkey patch FolderMixIn wrapping its method with Selections:
    Products.ERP5Form.SelectionTool.candidate_method_id_list:
     foldDomain
     setFlatListMode
     nextLanePage
     callSelectionFor
     setListboxDisplayMode
     viewPrevious
     setPage
     getSelectionParams
     getSelectionNameList
     checkAll
     setSelectionFor
     setDomainRoot
     getListboxDisplayMode
     setReportRoot
     getSelectionDomainDictFor
     selectionHasChanged
     setSelectionColumns
     getSelectionSortOrder
     setSelectionToAll
     getSelectionCheckedValueList
     getSelectionUidList
     setDomainDictFromParam
     setLanePath
     getSelectionInvertModeUidListFor
     unfoldDomain
     getSelectionIndexFor
     lastPage
     unfoldReport
     getSelectionChecksum
     setReportTreeMode
     setSelectionQuickSortOrder
     foldReport
     getSelectionFor
     previousPage
     setSelectionInvertModeFor
     getSelectionParamsFor
     setSelectionSortOrder
     setSelectionParamsFor
     setDomainRootFromParam
     getSelectionCheckedUidsFor
     getSelectionInvertModeFor
     nextPage
     setDomainTreeMode
     setSelectionToIds
     setSelectionCheckedUidsFor
     getSelectionValueList
     getSelectionListUrlFor
     viewNext
     getSelectionReportDictFor
     uncheckAll
     getSelectionNames
     getSelectionStats
     getSelectionColumns
     previousLanePage
     getSelectionSelectedValueList
     viewFirst
     setSelectionStats
     firstPage
     updateSelectionCheckedUidList
     viewLast
     clearCachedContainer
    => Should perhaps be moved to Folder.py (implemented in SelectionTool to
       avoid ERP5Type depending on ERP5Form: it probably makes no sense anymore
       though...).
  + makeTreeList() and createFolderMixInPageSelectionMethod() used in
    ERP5Form.{PlanningBox,ListBox} but these cannot be migrated (non-ERP5 objects).
  + Products.ERP5Type.tests.testFunctionalAnonymousSelection => erp5_ui_test? What about monkey patch?
  + Fix pylint warnings.