Introducing groups in Maven2 Idea Plugin

I think there is a need that the Maven 2 Idea plugin supports groups of modules. A friend of mine patched the following two files of the maven-idea-plugin:

1. IdeaMojo.java
2. IdeaProjectMojo.java

I will try to convince him filing this issue into the Maven Jira system, so everybody can benefit from this great patch. Maybe some day this patch will be included into the next Idea plugin version.