Add Location model which holds textual, geolocation coordiantes
or postal addresses. This migrates data off Image model metadata
onto the general Location model. It also adds the ability for location
to be set on MediaEntry, User, MediaComment and Collection models.
The geolocation plugin has been updated so that the location can be displayed
in more general places rather than explicitely on the MediaEntry view.
If GPS coordiantes are set for the User the profile page will also have the
OSM provided by the geolocation plugin.
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