Adding SettingsBuilderAdvice, to enable skipping default locations for settings files. Also, removing the settings cache, to enable call-by-call synchronization of settings between Maven embedder instances that share the same settings files. Next step is to refresh settings per-call to the embedder.
maven/components/trunk/maven-embedder/src/main/java/org/apache/maven/embedder/DefaultMavenEmbedderConfiguration.java
maven/components/trunk/maven-settings/src/main/java/org/apache/maven/settings/cache/