tools: drop old alternate hunit runner

tools/unittest.hs

@@ -1,24 +0,0 @@
-{-
-A standalone unit test runner using test-framework. Compared to hledger's
-built-in test runner, this one shows verbose ansi-colored hierarchic
-results, can run tests in parallel, and may have better quickcheck support.
--}
-
-import Test.Framework (defaultMain {-, testGroup-})
-import Test.Framework.Providers.HUnit (hUnitTestToTests)
---import Test.Framework.Providers.QuickCheck2 (testProperty)
-import Test.HUnit hiding (Test)
-import qualified Test.HUnit (Test)
---import Test.QuickCheck
-import Tests (tests)
-import System.Exit (-- exitFailure, exitWith,
-                               ExitCode(..))
-import System.IO (hGetContents, hPutStr, hFlush, stderr, stdout)
-import Text.Printf (printf)
---import Text.ParserCombinators.Parsec
-import Control.Monad (liftM,when)
-import Data.Maybe (fromMaybe)
-import System.Process (runInteractiveCommand, waitForProcess)
-
-main :: IO ()
-main = defaultMain $ concatMap hUnitTestToTests tests