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Work to extract data from netcdf files directly (not using thredds).

This did not make it into production because it was still far slower than calling thredds. The slowness was due to using cifs to mount the netcdf files instead of nfs.

This work also used the grid cell coordinate instead of lattitude, longitude. There were problems with this approach, I am not sure the correct array position was being extracted. There is offset around the image that needed to be taken account of, the offset was to make the image an exact multiple of the tile size of the map.

Features added ready for sprint review on 4th January 17