last of the error-reporting unit tests, and an additional error type to handle modules that are referenced but don't exist, which should stop the build. All tests pass.
maven/components/trunk/maven-core/src/main/aspect/org/apache/maven/errors/BuildFailureReporterAspect.aj
maven/components/trunk/maven-embedder/src/test/error-reporting-projects/testReportErrorApplyingMojoConfiguration/