there is no private source files anymore, thus renaming the method
another automated refactoring on method name for cosmetic
reduce the amount of methods around entity mutation/execution by killing a trivial one
standardize the name of an exception
Another small cleanup around execution/mutation

Make sure that Lightbot is not concerned by this code (by raising an
exception if someone changes the code so that this assumtion fails)
simplification: kill some unused functions and add some sanity verification
little cosmetics in the Exercise class
ask the embeeded java compiler to translate its error message (does not seem to translate to french in openJDK6)
kill dead code and improve comments
actually, ExerciseTemplatingEntity#run() was redefining its super#run() to the identical
kill useless code
Fix two bugs

- also deal properly with // comments that are not on the first line of the template
- HIDDEN sections placed after the solution are now properly handled
Kill a rogue call to mutateEntity by simplifying BDR2

We want to check whether the dance floor indications correctly lead to
the same trajectory for each dancer, so the entity does a bit more
than just dancing.

But now that we have world.getParam() (that was introduced with
TurtleWorlds), we don't have to hack the JLM internal directly this way.

This simplification will ease further refactoring of mutateEntity()
damn this is another redefinition of this method that is identical to its super()
kill a misleading and never used definition
cosmetic: automated refactoring to rename a symbol
embeed the GameState enum into the Game class as it doesn't make sense out of the Game class, somehow