Range checking on config file

[Hal Murray]

>> Unless I missed something, the code processing gonfig slots can't 
distinguish
>> -1 from 0xffffffff or the equivalent decimal number.
...

> That is correct.  Is this leading to a bug?

I don't know of a case where it currently causes problems.  We might be able 
to find one if we look hard enough.  I'd try typing in a big number where a 
negative number is reasonable.

Context is issue #440.

I tried changing NTP_MAXKEY to 0xffffffff and got several warnings.  When I 
looked at the code, the problem became interesting.

I don't see any simple fix.  I assume the clean fix is to add T_Unsigned.

I left NTP_MAXKEY at 16 bits.  I'm working on the documentation.


-- 
These are my opinions.  I hate spam.