Fix for bug #7863 (https://gna.org/bugs/index.php?7863).
This bug was reported by Sebastien Morin (https://gna.org/users/semor).
The fix was simply to set 'self.runs' to all the global diffusion models to be used by the AIC model selection step.
Authored by: bugman 2006-11-28
Parent: [r2887]
Child: [r2889]
