- Content type framework agnostic: Compatible with Dexterity and Archetypes by
  allowing definitions of Subsites on plone.folder.interfaces.IFolder objects.

- Remove dependency on p4a.subtyper. Enable and disable subsite menus are now
  in the object_buttons action menu.

- Remove controlpanel. Use language translations for translating interface
  elements instead.

- Remove upgrade steps and migration for 1.x based versions. Please migrate
  your site to the latest 1.x version before using 2.0.

- Remove deprecated ChildFolder content type.

- Remove upgrade steps. Please upgrade to most recent 1.x version in the 1.x
  branch, deinstall collective.lineage and use the 2.x branch then and
  reinstall. Please make a list of all your subsites before, as you have to
  re-enable them manually. There is no upgrade step for this yet.