Fix bug in output affixes when using the C-interface
Update user manual from EAG2.0 to EAG2.3
Addition of REAL affixes
Improve syntax directed editors:
  Check during transformation of parse tree into editor tree
  whether a node corresponds to the empty string. If so, remove layout.
Improve parsing: what is exactly needed to allow local groups.
Improve parsing: what is exactly needed to allow free member order.
Implement EAG-3
