Fix long names. Mode should be default 644, uid and gid should be equal to thhe entry's ones

Author: creker

src/Tar/TarOutputStream.cs

@@ -282,10 +282,11 @@ public void PutNextEntry(TarEntry entry)
 				TarHeader longHeader = new TarHeader();
 				longHeader.TypeFlag = TarHeader.LF_GNU_LONGNAME;
 				longHeader.Name = longHeader.Name + "././@LongLink";
-				longHeader.UserId = 0;
-				longHeader.GroupId = 0;
-				longHeader.GroupName = "";
-				longHeader.UserName = "";
+				longHeader.Mode = 420;//644 by default
+				longHeader.UserId = entry.UserId;
+				longHeader.GroupId = entry.GroupId;
+				longHeader.GroupName = entry.GroupName;
+				longHeader.UserName = entry.UserName;
 				longHeader.LinkName = "";
                 longHeader.Size = entry.TarHeader.Name.Length + 1;	// Plus one to avoid dropping last char