[reSIProcate] Helper::validateMessage

[Byron Campen]

	Since the stack makes heavy use of both the Status-Line and the  
topmost Via, we really should be checking to see whether they are  
well-formed on receipt. For example, in Transport::stampReceived, we  
use the topmost Via, and stampReceived is meant to be called  
immediately after basicCheck (from what I can tell). Having a well- 
formed Status Line is necessary, because it is used extensively in  
TransactionState.

I propose we add checks for these to Helper::validateMessage. Anyone  
with a differing opinion, please speak up.

Best regards,
Byron Campen
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