Resolve #3438858 "Add toggle to keep 2 x behavior"
Closes #3438858
Version 3.x of VAPN changed the behaviour when a node has no roles checked from allowing access for all to only allowing access for administrators. For some sites the work and/or training to switch to this is overwhelming.
This adds:
- An option at the VAPN settings form to use the old behaviour
- Uses ahebrank's patch as a basis to re-add showing nodes to all users. This will only run if the v2_behavior option is selected and no role has been checked for VAPN