Added attribute {CP_DELAYED_TASK}.environment, and removed the inheritance relation to EXECUTION_ENVIRONMENT. Moved shared parts of both initialization routines in CP_DELAYED_TASK to a common feature.
Added better preconditions in CP_AGENT_IMPORTER.
Added early loop exit in {CP_TUPLE_IMPORTER}.is_importable. Made {CP_TASK}.start frozen.
Fixed initialization clauses of all classes, and fixed some comments.