default modifier

Pyspf still had default modifier.  I added a flag to turn it off.  
However, which is better:

a) Ignore it, to match RFC.
b) Using probably means an older policy, so follow it to more likely
   get the intended result.

I think I will make pyspf throw an AmbiguityWarning for it in harsh mode.

Maybe do (b) in lax mode, and (a) in strict mode?

-- 
	      Stuart D. Gathman <[email protected]>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.