Test and document Terria<>WPS connections

[mpaget]

Example XML payloads

• Terria polygon to WPS
• Terria point to WPS
• WPS data/CSV to Terria
• WPS png/pdf to Terria - moved to Update Chart and URL output #19

[mpaget]

Output json format

• output_dict (in _render_outputs) creates a Terria v7 json data block. This includes the style:table block defined in datacube-wps-config.yaml.
• To use the v7 json block, need to set forceConvertResultsToV8: true in the Terria catalog.
• To output a v8 json block we would need to a) update output_dict and b) update style:table blocks in datacube-wps-config.yaml

See TerriaJS/RaPPMap#133 (comment)

Output type (json or chart)

• JSON is returning correctly. Chart/URL output is disabled/untested.
• Terria does not set an output type so we choose json (as opposed to chart/url output) - is this the best choice?
  • json output will render in Terria as a timeseries, given the v7/v8 considerations above
• The info flow is a little convoluted in the code - we should review this in light of new defaults.