Declare dependencies.
Cleanup (indent, pep8, pyflakes).
Cleanup ZCML.
Remove z3c.autoinclude includeDependencies, no longer required.
Replace old PloneTestCase tests with p.a.testing tests.
Fix plone site root interface.
Protect statusmessage viewlet with browserlayer.

The viewlet should not be rendered when the package is not installed.
Remove no longer used utility.