LaTeX writer: Put table captions above tables.

The standard seems to be captions above tables.  (See
http://tex.stackexchange.com/questions/3243/why-should-a-table-caption-be-placed-above-the-table)

src/Text/Pandoc/Writers/LaTeX.hs

@@ -471,19 +471,18 @@ blockToLaTeX (Table caption aligns widths heads rows) = do
   captionText <- inlineListToLaTeX caption
   let capt = if isEmpty captionText
                 then empty
-                else text "\\addlinespace"
-                     $$ text "\\caption" <> braces captionText
+                else text "\\caption" <> braces captionText <> "\\\\"
   rows' <- mapM (tableRowToLaTeX False aligns widths) rows
   let colDescriptors = text $ concat $ map toColDescriptor aligns
   modify $ \s -> s{ stTable = True }
   return $ "\\begin{longtable}[c]" <>
               braces ("@{}" <> colDescriptors <> "@{}")
               -- the @{} removes extra space at beginning and end
+         $$ capt
          $$ "\\toprule\\addlinespace"
          $$ headers
          $$ vcat rows'
          $$ "\\bottomrule"
-         $$ capt
          $$ "\\end{longtable}"
 
 toColDescriptor :: Alignment -> String

tests/tables.latex

@@ -1,6 +1,7 @@
 Simple table with caption:
 
 \begin{longtable}[c]{@{}rlcl@{}}
+\caption{Demonstration of simple table syntax.}\\
 \toprule\addlinespace
 Right & Left & Center & Default
 \\\addlinespace
@@ -12,8 +13,6 @@ Right & Left & Center & Default
 1 & 1 & 1 & 1
 \\\addlinespace
 \bottomrule
-\addlinespace
-\caption{Demonstration of simple table syntax.}
 \end{longtable}
 
 Simple table without caption:
@@ -35,6 +34,7 @@ Right & Left & Center & Default
 Simple table indented two spaces:
 
 \begin{longtable}[c]{@{}rlcl@{}}
+\caption{Demonstration of simple table syntax.}\\
 \toprule\addlinespace
 Right & Left & Center & Default
 \\\addlinespace
@@ -46,13 +46,12 @@ Right & Left & Center & Default
 1 & 1 & 1 & 1
 \\\addlinespace
 \bottomrule
-\addlinespace
-\caption{Demonstration of simple table syntax.}
 \end{longtable}
 
 Multiline table with caption:
 
 \begin{longtable}[c]{@{}clrl@{}}
+\caption{Here's the caption. It may span multiple lines.}\\
 \toprule\addlinespace
 \begin{minipage}[b]{0.13\columnwidth}\centering
 Centered Header
@@ -86,8 +85,6 @@ Here's another one. Note the blank line between rows.
 \end{minipage}
 \\\addlinespace
 \bottomrule
-\addlinespace
-\caption{Here's the caption. It may span multiple lines.}
 \end{longtable}
 
 Multiline table without caption: