Update pp-print program

benchmarks/pp-print/pp-print.cabal

@@ -21,6 +21,7 @@ executable pp-print
   main-is: Main.hs
   other-modules:
   -- other-extensions:
-  build-depends:       multiset, base >= 4.8, containers, aeson, aeson-pretty, bytestring
+  build-depends:       base >= 4.8, containers, aeson, aeson-pretty, bytestring
   hs-source-dirs:      src
   default-language:    Haskell2010
+  ghc-options:         -dynamic

benchmarks/pp-print/src/PopulationProtocol.hs

 module PopulationProtocol ( PopulationProtocol (..) 
-                          , Population
                           , createModuloProtocol
                           , createThresholdProtocol
                           , createOldThresholdProtocol
@@ -18,7 +17,6 @@ module PopulationProtocol ( PopulationProtocol (..)
 
 import Util
 import qualified Data.Set as S
-import qualified Data.MultiSet as MS
 import qualified Data.Map.Strict as M
 import Data.Tuple (swap)
 import Data.List (intercalate, nub)
@@ -47,8 +45,6 @@ type FlockOfBirdsProtocol = PopulationProtocol Int
 
 type VerifiableFlockOfBirdsProtocol = PopulationProtocol (Bool, Int)
 
-type Population qs = MS.MultiSet qs
-
 data ThresholdState = Neg Int | Pos Int | BiasPos Int | Passive Bool deriving (Ord, Eq, Show)
 
 data SimpleState = L Int | NL Int deriving (Ord, Eq, Show)