Refactor checksum code, and add Objectname hashing per uploaded objects

Add placeholder sha256, sha512 implementations from Intel with AVX, AVX2
and SSE4.1 extensions - with some boilerplate Go code.

pkgs/storage/storage.go

@@ -12,5 +12,5 @@ type ObjectDescription struct {
 	Name            string
 	Md5sum          string
 	Protectionlevel string
-	//	Hash   string - TODO
+	Hash            string
 }