Fix getting actual data from msg 31.
Fix getting actual data from msg 31.

We were not storing the scaled data. Also handle now the missing/range
folded values.

dopplershift/MetPy,deeplycloudy/MetPy,ShawnMurd/MetPy,Unidata/MetPy,jrleeman/MetPy,jrleeman/MetPy,Unidata/MetPy,ahill818/MetPy,ahaberlie/MetPy,ahaberlie/MetPy,dopplershift/MetPy