Add warnings for deprecation of aggregator-mojos bound to the lifecycle, and add error/error-logging (error when directly in the pom, error-logging when brought in via lifecycle mapping, etc.) when a direct-invocation mojo (@requiresDirectInvocation) is bound to the lifecycle.
maven/components/trunk/maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java