allow admin to recover users files in case of password lost

apps/files_encryption/hooks/hooks.php

apps/files_encryption/js/settings-admin.js

apps/files_encryption/lib/helper.php

apps/files_encryption/lib/util.php

lib/user.php

settings/ajax/changepassword.php

settings/css/settings.css

settings/js/users.js

settings/templates/personal.php

settings/templates/users.php

settings/users.php