- Added lots of docstrings - Added 'orientation' attribute for TreeSegmentWidget - Simplified code for TreeSegmentWidget - Major overhaul of TreeWidget:   - use hidden/shown widgets to deal with expanded/collapsed versions   - Added expanded_tree & collapsed_tree accessors   - Added bind_click_tree, bind_drag_tree, bind_click_leaves, etc..   - New demo code to show off the widgets
- Added lots of docstrings
- Added 'orientation' attribute for TreeSegmentWidget
- Simplified code for TreeSegmentWidget
- Major overhaul of TreeWidget:
  - use hidden/shown widgets to deal with expanded/collapsed versions
  - Added expanded_tree & collapsed_tree accessors
  - Added bind_click_tree, bind_drag_tree, bind_click_leaves, etc..
  - New demo code to show off the widgets


svn/trunk@697

nltk/nltk,nltk/nltk,nltk/nltk