- added connection port for fork/join item (it does not derive from   gaphas.item.Element class)
- added connection port for fork/join item (it does not derive from
  gaphas.item.Element class)


git-svn-id: 80d932a80928324f4d3d71af042e652e41ead033@2743 a8418922-720d-0410-834f-a69b97ada669

amolenaar/gaphor,amolenaar/gaphor