Made InterpreterHalt a top-level class otherwise RPython complains about it not being constant

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Use consistently lists as arguments to send()

Signed-off-by: Stefan Marr <git@stefan-marr.de>
Merge branch 'experiments/pypysom' of https://github.com/smarr/PySOM into experiments/pypysom

* 'experiments/pypysom' of https://github.com/smarr/PySOM:
  Use consistently lists as arguments to send()
  Made InterpreterHalt a top-level class otherwise RPython complains about it not being constant

Conflicts:
	src/som/interpreter/interpreter.py