Support --number-sections in RST output...

via the "section-numbering" directive in standalone output.

data/templates/default.rst

@@ -30,6 +30,10 @@ $if(toc)$
    :depth: $toc-depth$
 ..
 
+$endif$
+$if(number-sections)$
+.. section-numbering::
+
 $endif$
 $for(header-includes)$
 $header-includes$

src/Text/Pandoc/Writers/RST.hs

@@ -103,6 +103,7 @@ pandocToRST (Pandoc meta blocks) = do
   let context = defField "body" main
               $ defField "toc" (writerTableOfContents opts)
               $ defField "toc-depth" (show $ writerTOCDepth opts)
+              $ defField "number-sections" (writerNumberSections opts)
               $ defField "math" hasMath
               $ defField "title" (render Nothing title :: String)
               $ defField "math" hasMath