Here is the answer from Moby:
"Ben en fait, Arkham Asylum c'était le nom de la demo ou il y avait Heads up.
Donc le nom du mod c'est "heads up". L'autre, ça doit être quelqu'un qui l'a rippé et l'a appelé du nom de la demo..."
Which can be translated as:
"In fact, Arkham Asylum was the name of the demo where the Heads up module was used.
So, the name of the module is "heads up". The other name must come from the person that ripped the module and named it after the demo".
I just asked him the other two questions.

cheers