Gui improvements and ideas

app/views/reports/show.xlsx.axlsx

@@ -0,0 +1,10 @@
+wb = xlsx_package.workbook
+wb.add_worksheet(name: "Erfolgskriterien") do |sheet|
+  sheet.add_row SuccessCriterion.column_names
+
+  @report.elements.each do |element|
+    element.success_criteria.each do |sc|
+      sheet.add_row sc.attributes.values
+    end
+  end
+end