Add option admin_list_display to contrib.tagging, so one can turn that off.

Turning on the tags in admin's changelist incurs a db query for every item, which adds up fast. No idea why django-tagging is not using the value cached in the db field but instead rebuilds the tag list from scratch every time.
tree_editor: Add the query set to the returned result set in the INCLUDE_ANCESTORS case.

Django ORM is intelligent enough to optimise away the superfluous filter clauses in the common unfiltered case.
White space changes.
Finished feature optimise_include_ancestors.

    White space changes.

    tree_editor: Add the query set to the returned result set in the INCLUDE_ANCESTORS case.
    Django ORM is intelligent enough to optimise away the superfluous filter clauses in the common unfiltered case.
Merge branch 'next' of github.com:feincms/feincms into next
Fix a typo in the documentation
_build_tree_structure: do not reference removed variables
Fix a tiny flake8 complaint