Merge pull request #14 from plone/plip-13260-select-default-page-and-view

PLIP 13260 - migrate select_default_page and select_default_view to browser views
Rename .txt to .rst
small test cleanup
convert delete_confirmation to a z3c.form
Unlock item before deleting it
Use PLONE_APP_CONTENTTYPES_FIXTURE for DX testing
Migrate rename_form to z3c.form
Return IStatusMessage on rename