Eliminate mutual dependencies between the GF compiler and the PGF library

+ References to modules under src/compiler have been eliminated from the PGF
  library (under src/runtime/haskell). Only two functions had to be moved (from
  GF.Data.Utilities to PGF.Utilities) to make this possible, other apparent
  dependencies turned out to be vacuous.

+ In gf.cabal, the GF executable no longer directly depends on the PGF library
  source directory, but only on the exposed library modules. This means that
  there is less duplication in gf.cabal and that the 30 modules in the
  PGF library will no longer be compiled twice while building GF.

  To make this possible, additional PGF library modules have been exposed, even
  though they should probably be considered for internal use only. They could
  be collected in a PGF.Internal module, or marked as "unstable", to make
  this explicit.

+ Also, by using the -fwarn-unused-imports flag, ~220 redundant imports were
  found and removed, reducing the total number of imports by ~15%.

5 files changed, 6 insertions, 6 deletions

diff --git a/src/compiler/GF/Infra/CheckM.hs b/src/compiler/GF/Infra/CheckM.hs
index b998f7508..2f8a842e5 100644
--- a/src/compiler/GF/Infra/CheckM.hs
+++ b/src/compiler/GF/Infra/CheckM.hs
@@ -20,9 +20,9 @@ module GF.Infra.CheckM
 	  ) where
 
 import GF.Data.Operations
-import GF.Infra.Ident
+--import GF.Infra.Ident
 --import GF.Grammar.Grammar(Context)
-import GF.Grammar.Printer
+--import GF.Grammar.Printer
 
 import qualified Data.Map as Map
 import Text.PrettyPrint
diff --git a/src/compiler/GF/Infra/GetOpt.hs b/src/compiler/GF/Infra/GetOpt.hs
index ede561c90..648d51919 100644
--- a/src/compiler/GF/Infra/GetOpt.hs
+++ b/src/compiler/GF/Infra/GetOpt.hs
@@ -69,7 +69,7 @@ module GF.Infra.GetOpt (
 
 import Prelude -- necessary to get dependencies right
 
-import Data.List ( isPrefixOf, find )
+--import Data.List ( isPrefixOf, find )
 
 -- |What to do with options following non-options
 data ArgOrder a
diff --git a/src/compiler/GF/Infra/Option.hs b/src/compiler/GF/Infra/Option.hs
index 554468783..e0cba05e4 100644
--- a/src/compiler/GF/Infra/Option.hs
+++ b/src/compiler/GF/Infra/Option.hs
@@ -36,7 +36,7 @@ import GF.Infra.GetOpt
 import GF.Grammar.Predef
 --import System.Console.GetOpt
 import System.FilePath
-import System.IO
+--import System.IO
 
 import GF.Data.ErrM
 
diff --git a/src/compiler/GF/Infra/SIO.hs b/src/compiler/GF/Infra/SIO.hs
index 1011b8df4..ff2072987 100644
--- a/src/compiler/GF/Infra/SIO.hs
+++ b/src/compiler/GF/Infra/SIO.hs
@@ -20,7 +20,7 @@ module GF.Infra.SIO(
   ) where
 import Prelude hiding (putStrLn,print)
 import Control.Monad(liftM)
-import System.IO(Handle,hPutStrLn,hFlush,stdout)
+import System.IO(hPutStrLn,hFlush,stdout)
 import GF.System.Catch(try)
 import System.Cmd(system)
 import System.Environment(getEnv)
diff --git a/src/compiler/GF/Infra/UseIO.hs b/src/compiler/GF/Infra/UseIO.hs
index 140c2623f..d16440372 100644
--- a/src/compiler/GF/Infra/UseIO.hs
+++ b/src/compiler/GF/Infra/UseIO.hs
@@ -29,7 +29,7 @@ import System.IO.Error(isUserError,ioeGetErrorString)
 import System.Environment
 import System.Exit
 import System.CPUTime
-import System.Cmd
+--import System.Cmd
 import Text.Printf
 import Control.Monad
 import Control.Monad.Trans(MonadIO(..))