Added subjob to delete data in _map and measurements tables when files get deleted
Order by observation_date when creating line geometry for _map layers
Removed tPosgresqlcommit for null connection in delete_data_for_deleted_files subjob
Merge pull request #3 from AODN-ETL/add_delete_data_from_deleted_files_AND_order_by_time_when_creating_line_geometry

Added subjob to delete data in measurements and _map tables when files are deleted. Also added order by time when creating line geometry for map layers