LDEV-3293: Cast DAO methods' results to their return type.Java 8 is more restrictive about generics. Hibernate find() methods returns List<?> and it can not be quietly cast to List<SomeClass>. Each occurence was explicitly casted and warnings about the type being unchecked were supressed.
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.
