* Remove the unnecessary CPR parameter to mkUnfolding and friends

* Make sure that even trivial wrappers have a __inline__
  (this was causing lots of 'substWorker' DEBUG messages)

* Nuke demand info when the unfolding is a value
  (see notes with IdInfo.setUnfoldingInfo)

* Add an update-in-place test to the 'interesting context'
  predicate in SimplUtils.