WFlowInstances_Delete, WFlows_Delete, WFlowInstances_DeleteForProject logic for deleting related workflow instance data is inconsistent

When Workflow Instance is deleted, the following records are deleted:

   - Topics and Notes related to the workflow instances, workflow activities and workflow tasks for the instance

   - WFlowRequestedReviews, WFlowPrescreenReviews, WFlowReviewResults, WFlowReviews, 

        WFlowReviewChecklistInstanceStatuses, WFlowReviewChecklistInstances, 

        WFlowChangemarkInstances, WFlowReviewCycles, WFlowActivityProps, WFlowFormletProps,

        WFlowFormletActivities, WFlowScriptReferences, WFlowScriptCustomReferences, WFlowScripts,

        WFlowTasks, WFlowConditionals, WFlowStartupTasksInstances, WFlowActivityHistory,

       WFlowActivityTemplates, WFlowReviewConfigTemplateInstances, wflowactivities  associated to the workflow instance 

   - Metadata Keys and Values associated to the workflow instance, workflow activities, formlet activities and global formlets for the instance

   - EntityTree associated to the workflow instance, workflow activities, formlet activities and global formlets for the instance

   - WFlowInstance record

For WFlowsVersion deletion, the following data are deleted:

   - WFlowStartupTasksTemplates, WFlowActivityPropsEditor, WFlowActivityTemplates, 

      WFlowFormletPropsEditor, WFlowFormletActivitiesEditor, WFlowScriptReferences, 

      WFlowScriptCustomReferences, WFlowScripts, WFlowConditionalsEditor, 

      WFlowConditionalLegsEditor, WFlowFormletPropsEditorGlobal, 

      WFlowFormletActivitiesEditorGlobal, WFlowActivityTemplates records associated to the WFlowsVersion record

   - WFlowVersion record

For WFlows Definition deletion, the following data are deleted:

    - All instances associated to the WFlows and their related data

   - All WFlowsVersion associated to the WFlows record

   - Metadata Keys and Values associated to the WFlows record

   - EntityTree associated to the WFlows record

   - WFlows record