Preserve slugs & URLs when pages are moved.
Remove obsolete reset_slugs().
Check overridden() when changing slug.
In set_parent(), call save() before get_slug().
Make slug changes propagate to all descendant pages.
pep8 fix
Fix bug in Page.set_parent() when no parent set.
Allow passing None to Page.set_parent().
Add tests for Page.get_slug() and Page.get_parent().
Remove debugging print statement.
Fix bug in slug handling when adding a new page.
Move clean_content to new DisplayableAdminForm.
Merge branch 'master' into slug_reset
Fix generating descriptions when saving page instances directly, as their content type subclass fields weren't available for the description.
Merge
Merge
Allow for no content model in Page.description_from_content.