#7 Explanations of changes in minor releases

[Knut Franke]

Version 0.2.0 introduced several changes to the user interface, the purpose of which may not always be obvious to users. Handbook and homepage should contain some content on "the road behind" / "new features", i.e. changes in past releases.

Particularly, it should be mentioned why the behaviour of tables with respect to selection of multiple columns changed, and best practices for the new version. See
https://sourceforge.net/forum/message.php?msg_id=6648418