removing produtions structure from Chart (moved into ScalaChart)
removing produtions structure from Chart (moved into ScalaChart)

Ignore-this: de4f2f9a775209c45ea8820f1d9f828

darcs-hash:20100421125827-e7b0d-dd4dcdacdebc7842714d9874c91f66afc4a33568.gz

GrammaticalFramework/JPGF,GrammaticalFramework/JPGF,GrammaticalFramework/JPGF,GrammaticalFramework/JPGF