fix some typos spotted while translating and pythonize some exos
move the universe to another package to ensure that exerciseEntities have the right imports
fix the equals() so that pancake exercises can be solved
cosmetics and fixups in the entities of pancakes (both java and python)
retranslate every exercises back to 100%
BuggleWorld.diffTo(): properly report if the world names differ
more verbose error message when an exercise is not ported to python
Use the translated names of menu entries within missions
make sure that serialized turmite worlds are not read as simple buggle worlds
serialization of turmiteworlds were (manually) changed