new harvester to process AERONET data

The dataset is part of the SRS OC LJCO subfacility. The
harvester reads a .lev2 (csv) file from a public folder
downloaded everyday by a python script. see:
https://github.com/aodn/data-services/blob/master/SRS/SRS_OC_LJCO_AERONET/downloadAeronetData.py
Update LJCO AerONET Harvester

*Change include_data to include in the Source context group.
*logging configuration and Context override in the main job
*use the iPostgresqlOutput component instead of tPostgresqlOutput.
*update GeoNetwork’s Spatial Extent
*checked that geometry is valid and added a GIST index to geometry column
*"timestamp with time zone" instead of without
Merge pull request #87 from aodn/aeronet_harvester

new harvester to process AERONET data