Blog post for the new scala installation support (sourcelevel toggle)

To provide more info on current developments.
Hm, I was under the impression that the only thing one needs to do is to change the container. So, once the user changed the container, he needs to go to project settings and add manuall `-Xsource`? But if he does it from this page (instead of via classpath-container), the setting is added automatically?

Sorry for discussing it here, but this is a great document :)