everything is building again

However, the test suite fails some quickchecks, so this branch is not
yet in a mergeable state.

Assistant/Sync.hs

@@ -5,6 +5,8 @@
  - Licensed under the GNU AGPL version 3 or higher.
  -}
 
+{-# LANGUAGE OverloadedStrings #-}
+
 module Assistant.Sync where
 
 import Assistant.Common