Removed dead code

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed incompletely refactored primitives

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed access to lexical super class

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fixed creation of FieldWriteNode

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Add a few __str__ methods to make debugging more enjoyable

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Send methods need to return the result

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Fix implementation of GlobalReadNode

It was not triggering #unknownGlobal:, and the setting of values was broken.

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Added missing support for #doesNotUnderstand:

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