Updating Usages

Removing unused method

Adding JS Doc

fix wizard test, adjust to changed parameters of the tested method, introduced by 9caa354cfc1f73159f335646ca89be4db72b125e

set result entry identifier earlier, i.e. before a continue for the same level can happen. otherwise  will always get the same value and we end up in an infinite loop

add unit test to make sure the infinite loop never comes back

Conflicts:
	apps/user_ldap/tests/wizard.php

replace chosen with select2 to provide ajaxified user and group selection for files_external, fixes #7499

remove minified select2 js

show avatars for users, simpler results

remove unneeded users and groups from settings template

fix css, escape user and group names

As constants not defined within a class cannot be automatically found by the
autoloader moving those constants into a class makes them accessible to
code which uses them.

Signed-off-by: Stephan Peijnik <speijnik@anexia-it.com>