Added a receiver for all relevant models (Those with file fields e.g. Talk, Publication, News, Person, Banner, Poster) to listen for pre_delete signals and remove all files owned by that item to improve space saving on server
Added a receiver for all relevant models (Those with file fields e.g. Talk, Publication, News, Person, Banner, Poster) to listen for pre_delete signals and remove all files owned by that item to improve space saving on server

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