Refactoring, 25% speedup.

* Checks now use Writer monad instead of State

* Parser no longer emits notes unrelated to parsing.

* All checks are now passed a parameter value, containing shell type,
  map from notes to parents and such. This eliminates recalculation
  and removes the need for a special group of parent examining checks.

ShellCheck/Simple.hs

@@ -44,9 +44,9 @@ shellCheck :: String -> [ShellCheckComment]
 shellCheck script =
     let (ParseResult result notes) = parseShell "-" script in
         let allNotes = notes ++ (concat $ maybeToList $ do
-            (tree, map) <- result
-            let newMap = runAllAnalytics tree map
-            return $ notesFromMap $ filterByAnnotation tree newMap
+            (tree, posMap) <- result
+            let list = runAnalytics [] tree
+            return $ map (noteToParseNote posMap) $ filterByAnnotation tree list
             )
         in
             map formatNote $ nub $ sortNotes allNotes