Fixes #2357
Finalizing PolytomousKeyListEditor
Link in PolytomousKeyListEditor is recognizable as such; Added a menu
The node list gets generated correctly now using breadth first algorithm
Changes in details view get propagated to editor. Fixed a bug in MultilanguageTextElement implementation
Polytomous keys may be viewed as list as well
Working on the polytomous key editor
Improving polytomous key handling
had to rename the packages to make them compliant with buckminster