status, all users, guests flags

OO-3153: check the value of the taxonomy tree preference for the document pool and the question pool

OO-3055, OO-3047: implementation of taxonomy module with new site, full text search, webdav access, REST API...

OO-2969: implements a maxima custom operator, add checker for the type of certain variables by import, more code to find the editor and version of the editor in manifest

OO-2969: implements process to mark question as "OpenOLAT" question that the editor can open, implements feedback based on conditions, implements unified feedback editor with condition based feedbacks, make the unknown question panel html match the runtime html markup