rename: Sort lectures / examiners

Sort lecture and examiner names to provide some consistent ordering
(e.g. to prevent duplicates).

Fixes #78

src/python/klausurarchiv/renaming.py

@@ -651,6 +651,7 @@ class RenameActivity:
           s.attr_error)
         return False
       s.examiners.append(item)
+      s.examiners.sort()
       return True
     elif item[2]==s.aliases.lectures:
       if item[1] in [ v[1] for v in s.lectures ]:
@@ -659,6 +660,7 @@ class RenameActivity:
           s.attr_error)
         return False
       s.lectures.append(item)
+      s.lectures.sort()
       return True
     elif item[2]==s.aliases.examTypes:
       s.examType=item