still opt-in-only at this point, the traditional tailbone-native
master is used by default.
new wutta master is not feature complete yet. but at least things
seem to render and form posts work okay..
when enabled, this uses a "completely" wutta-based stack for the view,
grid and forms. but the underlying DB is of course rattail, and the
templates are still traditional/tailbone.
this starts to get things more aligned between wuttaweb and tailbone.
the use case in mind so far is for a wuttaweb view to be included in a
tailbone app.
form and grid classes now have some new methods to match wuttaweb, so
templates call the shared method names where possible.
templates can no longer assume they have tailbone-native master view,
form, grid etc. so must inspect context more closely in some cases.
