timer.addPeriodic doesn't return the good function

[plule]

I'm not totally sure about this, but addPeriodic seems to return a function which will only last during the first cycle. After that, timer.add() is called again and the return value is not valid anymore. Thus timer.cancel doesn't work with periodics.

I couldn't work on a real fix (I encounter it during miniLD, so not much time), but I have an ugly workaround (separating periodics and non periodics) if you are interested.

[plule]

Matter of fact, I can't reproduce it on a simple example and it seems that this bug doesn't exists. I must have messed up something. Sorry about that :)