Switch to new options handling.

This changes lots of stuff, let me know if it broke anything.

Comments:

- We use a local hacked version of GetOpt that allows long forms of commands to start with a single dash. This breaks other parts of GetOpt. For example, arguments to short options now require a =, and does not allo pace after the option character.

- The new command parsing is currently only used for the program command line, pragmas and the arguments for the 'i' shell command.

- I made a quick hack for the options for showTerm, which currently makes it impossible to use the print style flags for cc. This will be replaced by a facility for parsing command-specific options.

- The verbosity handling is broken in some places. I will fix that in a later patch.

src-3.0/GF/Compile/GetGrammar.hs

@@ -39,15 +39,17 @@ import System.Cmd (system)
 
 getSourceModule :: Options -> FilePath -> IOE SourceModule
 getSourceModule opts file0 = do
-  file <- case getOptVal opts usePreprocessor of
-    Just p -> do
-      let tmp = "_gf_preproc.tmp"
-          cmd = p +++ file0 ++ ">" ++ tmp
-      ioeIO $ system cmd
-      -- ioeIO $ putStrLn $ "preproc" +++ cmd
-      return tmp
-    _ -> return file0
+  file <- foldM runPreprocessor file0 (moduleFlag optPreprocessors opts)
   string    <- readFileIOE file
   let tokens = myLexer string
   mo1  <- ioeErr $ pModDef tokens
   ioeErr $ transModDef mo1
+
+-- FIXME: should use System.IO.openTempFile
+runPreprocessor :: FilePath -> String -> IOE FilePath
+runPreprocessor file0 p =
+    do let tmp = "_gf_preproc.tmp"
+           cmd = p +++ file0 ++ ">" ++ tmp
+       ioeIO $ system cmd
+       -- ioeIO $ putStrLn $ "preproc" +++ cmd
+       return tmp