Powerpoint writer: Add further tests

Tests added for:

 - table of contents
 - endnotes
 - endnotes with table of contents

Powerpoint output checked in MS PowerPoint 2013 (Windows)

test/Tests/Writers/Powerpoint.hs

@@ -198,4 +198,19 @@ tests = [ pptxTest
           def{ writerSlideLevel = Just 1 }
           "pptx/slide_breaks.native"
           "pptx/slide_breaks_slide_level_1.pptx"
+        , pptxTest
+          "table of contents"
+          def{ writerTableOfContents = True }
+          "pptx/slide_breaks.native"
+          "pptx/slide_breaks_toc.pptx"
+        , pptxTest
+          "end notes"
+          def
+          "pptx/endnotes.native"
+          "pptx/endnotes.pptx"
+        , pptxTest
+          "end notes, with table of contents"
+          def { writerTableOfContents = True }
+          "pptx/endnotes.native"
+          "pptx/endnotes_toc.pptx"
         ]

test/pptx/endnotes.native

@@ -0,0 +1,2 @@
+Pandoc (Meta {unMeta = fromList []})
+[Para [Str "Here",Space,Str "is",Space,Str "one",Space,Str "note.",Note [Para [Str "Here",Space,Str "is",Space,Str "the",Space,Str "note."]],Space,Str "And",Space,Str "one",Space,Str "more",Space,Str "note.",Note [Para [Str "And",Space,Str "another",Space,Str "note."]]]]