The source code was checked for duplicate code in descriptor calculation classes and simple atom property calculation classes were added to facilitate this task.
The API documentation was a little bit improved, especially for the descriptor and the io classes.
The tutorial was extended with 26 pages explained examples (source code snippets) for standard tasks.
Unfortunately now the duplicate code moved to these helper classes !;-) Much greetings to the PrettyMessDetection (PMD) crew (http://pmd.sourceforge.net/cgi-bin/webpmd.pl). removing duplicated code is much more complicated than expected.