move bat exercises on integer arrays into the welcome lesson (fix #21)
port array bat exercises to python, don't fail on empty arrays
cosmetics: use one-liner comments to easily comment blocks of exercises
port the bat array exercises to python (make their tests pass)
I didn't notice earlier that this test does not even compile
set a timeout onto tests to avoid issues
warnings are evil, fix them or ignore them
increase that timeout because turmite exercises are a bit long
document last changes
pythonizes; anti-cheating protections should not prevent to pass the exercises
fix markup that breaks po4a
not sure of where to put the test runner, but within the model feels wrong
avoid a NPE when stoping a demo (that's not a lesson that is running)
let the turmite worlds display the differences in amount of steps
Port another turmite exercise to python
rename a variable so that its semantic becomes clear