[gradsusr] Only plot data IF var <= 10

[Christopher Gilroy]

Hey guys, I don't believe IF statements are meant to be used like this
which would make sense why it's not working:

'define maxtemp = max(tmpprs,lev=1000,lev=500)-273.15'

if ( maxtemp <= 5 )
'd tmp2m'
endif

That expectation would have been to only plot tmp2m where maxtemp <= 5.

As I said, I don't think it's as easy/designed to use IF statements like
this? I think I may have to do something with const and maskout in order to
do something like this?
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