Default rules

- cleanup audit-trail -> AuditTrail
- fixed hardcoded debug audit trailing
I think there should be two functions:

One only using the key aspects 
facts:canonical-serialization($facts as object*) as string*

One allowing for excluding covered-aspects
facts:canonical-serialization($facts as object*, $covered-aspects as string*) as string*

Both of them should allow for a sequence of facts being passed as parameter.