Introduce type RawIdent; only 9 imports of Data.ByteString.Char8 remain

The fact that identifiers are represented as ByteStrings is now an internal
implentation detail in module GF.Infra.Ident. Conversion between ByteString
and identifiers is only needed in the lexer and the Binary instances.

src/compiler/GF/Compile.hs

@@ -35,7 +35,6 @@ import qualified Data.Map as Map
 --import qualified Data.Set as Set
 import Data.List(nub)
 import Data.Maybe (isNothing)
-import qualified Data.ByteString.Char8 as BS
 import Text.PrettyPrint
 
 import PGF.CId
@@ -50,7 +49,7 @@ compileToPGF :: Options -> [FilePath] -> IOE PGF
 compileToPGF opts fs =
     do gr <- batchCompile opts fs
        let name = justModuleName (last fs)
-       link opts (identC (BS.pack name)) gr
+       link opts (identS name) gr
 
 link :: Options -> Ident -> SourceGrammar -> IOE PGF
 link opts cnc gr = do