AERONET Fix Context

 * issue running this harvester on nsp14. The reason seems to be the use of a tSystem component calling sed
   and not able to write a temporary file. The context 'output_file' is not part of the global ones and was
   empty for the 'deployment' context list. This should fix it.
Merge pull request #121 from aodn/aeronet_Context

AERONET Fix Context