Fix redundant imports and versioning error

.gitignore

 *.o
 *.hi
+Main

lib/GEODE/Metadata.hs

@@ -24,7 +24,7 @@ import GEODE.Metadata.SplitContext as SplitContext hiding (page, rank)
 import GEODE.Metadata.TSV as TSV
 import GEODE.Metadata.TSV.Header as TSV_Header
   ( Concat(..), DefaultFields(..), Glue(..), HasDefaultHeader(..)
-  , HasDefaultHeader(..) )
+  , WithDefaultHeader(..) )
 import GEODE.Metadata.Types as Types
 
 list :: [Text] -> String

test/GEODE/Metadata/TestEntry.hs

 {-# LANGUAGE OverloadedStrings #-}
 module GEODE.Metadata.TestEntry (testEntry) where
 
-import Control.Monad.State (evalState)
-import Data.ByteString.Char8 as BS (pack)
 import Data.Csv (ToNamedRecord(..))
 import Data.Foldable (toList)
 import Data.HashMap.Strict ((!?))
-import Data.Map as Map (empty)
 import Data.Text (dropEnd)
 import GEODE.Metadata (evalSplit, newEntry, normalize)
 import GEODE.Metadata.Entry (Entry(..))

test/Main.hs

@@ -3,7 +3,6 @@ module Main (main) where
 import Test.HUnit (Test(..), runTestTTAndExit)
 import GEODE.Metadata.TestPrimaryKey (testPrimaryKey)
 import GEODE.Metadata.TestEntry (testEntry)
-import System.Exit (exitFailure, exitSuccess)
 
 testMetadata :: Test
 testMetadata = TestLabel "Metadata suite" $