[GRASS5] $GIS_OPT = "(null)" to "" in scripts

[Hamish]

> > Does it also cover the recently reported security issues?
> > http://intevation.de/rt/webrt?serial_num=2877&display=History
> 
> No, I'm working on them next.

[scripts are pretty much done now, please test]


> scripts/i.oif/i.oifcalc

could someone test that one? There is this sort of thing:

awk '{print sum > "$temp_file"}'


which I am pretty sure will break but don't know enough awk to fix.



thanks,
Hamish