LaTeX reader: improved parsing of tables.

Reader can now parse simple LaTeX tables such as those
generated by pandoc itself.

We still can't handle pandoc multiline tables which involve
minipages and column widths.

Partially addresses #2669.

src/Text/Pandoc/Readers/LaTeX.hs

@@ -1088,7 +1088,7 @@ environments = M.fromList
          resetCaption *> skipopts *> blocks >>= addImageCaption)
   , ("center", env "center" blocks)
   , ("longtable",  env "longtable" $
-         resetCaption *> skipopts *> blocks >>= addTableCaption)
+         resetCaption *> simpTable False >>= addTableCaption)
   , ("table",  env "table" $
          resetCaption *> skipopts *> blocks >>= addTableCaption)
   , ("tabular*", env "tabular" $ simpTable True)
@@ -1374,7 +1374,9 @@ hline = try $ do
   return ()
 
 lbreak :: LP ()
-lbreak = () <$ try (spaces' *> controlSeq "\\" <* spaces')
+lbreak = () <$ try (spaces' *>
+                    (controlSeq "\\" <|> controlSeq "tabularnewline") <*
+                    spaces')
 
 amp :: LP ()
 amp = () <$ try (spaces' *> char '&')
@@ -1402,9 +1404,15 @@ simpTable hasWidthParameter = try $ do
   skipopts
   aligns <- parseAligns
   let cols = length aligns
-  optional hline
-  header' <- option [] $ try (parseTableRow cols <* lbreak <* hline)
-  rows <- sepEndBy (parseTableRow cols) (lbreak <* optional hline)
+  optional $ controlSeq "caption" *> skipopts *> setCaption
+  optional lbreak
+  spaces'
+  skipMany hline
+  header' <- option [] $ try (parseTableRow cols <* lbreak <* many1 hline)
+  rows <- sepEndBy (parseTableRow cols) (lbreak <* optional (skipMany hline))
+  spaces'
+  optional $ controlSeq "caption" *> skipopts *> setCaption
+  optional lbreak
   spaces'
   let header'' = if null header'
                     then replicate cols mempty