fixes to grid.m

[Doug Stewart]

I have now got a proper changset file

I did a

hg clone http://www.octave.org/hg/octave octave6

fixed the grid.m file

hg ci

hg export  -o fixgrid  tip


This makes the "minor","on" and "off"   work

Would someone look this over and update the source please.

Doug
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