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
Merge remote-tracking branch 'josh/master' into josh

This integrates josh's changes to create a valid lat/lon file.

I also cleaned up and simplified the code, it now copies over the
min/max values (after conversion) as well as comments.

Conflicts:
	modules/data.atmosphere/R/met2CF.Ameriflux.R
Merge pull request #282 from PecanProject/josh

integrators lat/lon/time changes from Josh