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* add_world: (51 commits)
  bug found and eliminated
  warning eliminated
  we use a new ghc
  back to old sep
  some trivial implementations
  trusted functions - although not implemented things inside
  trusted external functions
  trusted functions
  trust files
  a back button
  Various errors with state manipulation for declarative debugging
  handling verbessert.
  no evaltime, evalspace
  an error message for untreatable global states
  module global works with restrictions
  external functions of time module implemented
  generalized int from and to functions
  external functions of Directory now implemented
  minimal change for debug call
  type of unsafe corrected
  ...