Rename test module to match tested module's name.
Make ``kotti._resolve_dotted`` return the resolved settings dict instead of modifying it in place.  This is especially needed for the test fixtures, where it's otherwise almost imposibble to tell whether you have to append a resolved something to an array or a dottet name to a string.  Also add app and webtest fixtures.
Make ``conftest.py`` in scaffold *much* easier by moving commonly needed fixtures to ``kotti.tests``.
Unicode columns need a explicit size with MySQL.
Only inject fixtures that are actually needed.