lfpinit() signed or unsigned?

[Hal Murray]

hmurray at megapathdsl.net said:
> There is an implicit assumption that the two (l_fp) times that you subtract
> are in the same epoch. 

Argh.  That's wrong.  It works across the epoch boundary.  The requirement is 
"close-enough", but you have to stand on your head to recognize that the the 
boundary crossing can be close.

I'll have to think hard about the boundary case.  I think the subtract 
overflows but it gets the right answer.


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