ntpviz - scale for "nsat" graph is somtimes wrong for "Local GPS"

[Hal Murray]

Gary said:
> That us just gnuplot trying to put enough divisions in the sacle. gnuplot
> assumes everything is a float.

> Nope.  Documented and expected gpsuplot behavior.  I'll look to see if there
> is a way to tell gnuplot that is an integer. 

set y2tics 1

That doesn't tell it anything about integer-ness, just stops making the 
non-integer grid lines/marks

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