Store spatial extents provided in the package form

[amercader]

Consolidate the extra spatial as the field for providing information about the geographic extent of the package. This will integrate automatically with the spatial search and give developers a single point to develop geospatial features.

[rgrp]

Assume these are the 3 spatial fields listed on ​http://wiki.ckan.net/Geospatial_Capabilities. I'm a big +1 here. Starting point would be a bit more documentation on that wiki page. Questions:

• Is this work going in ckanext-spatial?
• What is being proposed here, I assume, is to automatically index those fields in our geospatial search.
• Should we develop a simple display widget using google maps or similar (this is orthogonal to the WMS preview i think) which *just* uses the core fields. This is probably a separate ticket and possibly separate from ckanext-spatial extension.