Converted tabs to spaces

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added tests for accessing fields of the superclass

This was missing so far, now it is legal to access superclass fields without going trough accessors.
The same holds for the class side, fields of the super class on the class-side can be accessed directly as well.

Signed-off-by: Stefan Marr <git@stefan-marr.de>