Add a test play/read page, with tests
Only redirecto to play.read if intented for play.index
Add a play.ok template with tests
Add a play.type page with tests
play/* routes add an originName field to outgoing transitions

This will be used later for controlling authorised transitions. For
instance, ok->read is not allowed, and should display an error and reset
the task.
Make test a bit more robust
More robust test
Still more robust test
Move redirect into play.index
Add some debug logging
Add origin management for TracingRoute