GOES13 MAGPD numerical data

Adding GOES MAGPD numerical data meta data for 1 and 5 m resolution data.
For data at http://satdat.ngdc.noaa.gov/sem/goes/data/new_avg/
Validated and passed URL checks, but not reference checks.  Someone please
check the GOES 13 EPS instrument meta data.

Signed-off-by: james weygand <jweygand@igpp.ucla.edu>