CNG-1: Add basic MinApp integration implementation to public CVS. Temporarily override security for several servlets until OpenID support is introduced. Allow hiding chosen buttons in Planner using URL parameter. Allow overriding Back button target in Planner using URL parameter.
LDEV-2646: Several fixes for Planner access control: "Viewing" and "removing" is for whole nodes, not just templates. Node's owner can not remove it if there are subnodes he doesn't have permissions to remove.