- remove all messages on communication diagram - removed assertion, which is no longer required as message kind is   implemented as derived association
- remove all messages on communication diagram
- removed assertion, which is no longer required as message kind is
  implemented as derived association


git-svn-id: 80d932a80928324f4d3d71af042e652e41ead033@2006 a8418922-720d-0410-834f-a69b97ada669

amolenaar/gaphor,amolenaar/gaphor