Fixing tree panel disalignement
HTML fix
Fixing issue THRONE-65
Adressing issue THRONE-78. Hidding non functionning stuff + fixing user selection in "Access control box"
Hidding unwanted element for release 1.1 as decided during Sprint meeting 3
Modification according to discussion over commit f146752f8f1ef3cfe3734d6d25e411d80f69a97d.
Merge branch 'gitlab/f.guitton'

Conflicts:
	grails-app/controllers/UserGroupController.groovy
Fixing background admin panel component (will not be accessible in the interface though)
Merge branch 'gitlab/f.guitton'