SAPIC: translate processes by default (tamarin-prover#530)

* Updated Stack to LTS 20-12 (GHC 9.2.6).

* Have translation into MSR rules be the default.

---------

Co-authored-by: Robert Künnemann <robert.kuennemann@cispa.saarland>

src/Main/TheoryLoader.hs

@@ -253,10 +253,8 @@ mkTheoryLoadOptions as = TheoryLoadOptions
     autoSources   = return $ argExists "auto-sources" as
 
     outputModule
-    -- when proving, we act like we chose the Msr Output module.
-     | Nothing  <- findArg "outModule" as , [] /= findArg "prove" as = return $ Just ModuleMsr
-    -- default
-     | Nothing  <- findArg "outModule" as = return $ Just ModuleSpthy
+    -- MSR is default module, i.e., we translate by default ... otherwise we get warnings for actions used in lemmas that appear only in processes.
+     | Nothing  <- findArg "outModule" as = return $ Just ModuleMsr
      -- Otherwise, find output module  that matches string argument
      | Just str <- findArg "outModule" as
      , Just modCon <- find (\x -> show x  == str) (enumFrom minBound) = return $ Just modCon
@@ -337,7 +335,6 @@ loadTheory thyOpts input inFile = do
     isDiffMode   = L.get oDiffMode thyOpts
     isMSRModule  = L.get oOutputModule thyOpts == Just ModuleMsr
 
-
     unwrapError (Left (Left e)) = Left e
     unwrapError (Left (Right v)) = Right $ Left v
     unwrapError (Right (Left e)) = Left e