Fixes #2681
refactoring of package names for consistency
Refactoring of property change handling. Also fixes #2363
Fixes #2436; PolytomousKeyListView now allows deletion of multiple elements
Fixes #2357
Finalizing PolytomousKeyListEditor
Changes in details view get propagated to editor. Fixed a bug in MultilanguageTextElement implementation
PolytomousKeyNodeDetailElement now shows the parent's question.
Improving polytomous key handling
Refactoring selection elements so they can be configured
Fixes #2312
had to rename the packages to make them compliant with buckminster