copy variables of interest to a new file. Don't think we actually want APARpct and ZL, but left them for now.

Every variable has lat,lon,time dimensions. 1 exception is time variable. DTIME and time are also duplicates, which needs to be fixed.

Variables with conversions were not completely re-written as in previous version - this preserves more variable attribute information.

Panoply does not recognize the missing values for air_pressure and CO2 properly. All other variables plot normally