GeoNode/geonode — pull request #1610 by mwengren (2014-07-29 15:00:34+00:00)
Title: Thumbnail fix pr

__What does this PR do?__
Reverses ForeignKey relationship between Thumbnail and ResourceBase to be Many -> One. Should solve repeated thumbnail issue on Updatelayers execution. The result is a single file on the filesystem per ResourceBase object. Cascade deletes Thumbnails on ResourceBase delete. Doesn't delete thumbnail file on disk, will see about adding. Please test as this is a bit untested.

Note: Also fixes a legacy issue with Updatelayers code in gs_slurp where some code was overwritten in a bulk merge following 2.0 release.