checkdates: disable/document stack script stuff

hledger/Hledger/Cli/Commands/Checkdates.hs

@@ -1,9 +1,15 @@
-#!/usr/bin/env stack
-{- stack runghc --verbosity info
-   --package hledger-lib
-   --package hledger
-   --package here
+{- #!/usr/bin/env stack -}
+{- stack runghc -- 
+    --ghc-arg='-main-is _main' 
+    --verbosity info
+    --package hledger-lib
+    --package hledger
+    --package here
 -}
+-- We could probably still allow running these command modules as scripts, if useful.
+--import Hledger.Cli.Utils (withJournalDo)
+--main :: IO ()
+--main = getHledgerCliOpts checkdatesmode >>= flip withJournalDo checkdates
 
 {-# LANGUAGE QuasiQuotes #-}