LDEV-3171: Give a Monitor an option to remove learner's content from activities when moving him backwards in a sequence. Implementation of content-removing method for most of tools.
LDEV-3070: Allow enabling single activity lessons for each organisation, not globally in sysadmin panel. Sort Tool names. Use their i18n names instead ones from DB. Fix layout issues. Fix bugs in Daco Tool.
LDEV-2374: - Vote now accepts nominations created by Teacher as well as ones derived from input. - Teacher can now limit number of Learners contributing to Vote's nomination pool. - Each tool now declares which DataOutputDefinitions it can accept for Data Flow.