title: Cyclic adaptive spline in mgcv
body: <p>I want to fit a GAM to data with a cyclic predictor and where most of the wiggliness in a specific part of the cycle.</p>
  <p>Is there any way to make a cyclic spline (bs = 'cc' or 'cp') adaptive? ... or, equivalently, make an adaptive spline (bs = 'ad') cyclic?</p>