Merge branch 'Product/801-refactorFileMetadata' into 'Sprint/2020-12'

Product/801 refactor file metadata

See merge request coscine/cs/database!89

src/Database/Models/MetadataModel.cs

@@ -43,12 +43,12 @@ namespace Coscine.Database.Models
             return resource;
         }
 
-        public string GenerateId(string resourceId, string filename, string version)
+        public string GenerateId(string resourceId, string filename)
         {
             // Double UrlEncode since converting it to Uri executes one UrlDecode and Virtuoso
             // graph names don't support special characters
             var encodedFileName = HttpUtility.UrlEncode(HttpUtility.UrlEncode(filename));
-            return $"https://purl.org/coscine/md/{resourceId}/{encodedFileName}/{version}/";
+            return $"https://purl.org/coscine/md/{resourceId}/{encodedFileName}/";
         }
 
         public Uri CreateUri(string graphName)