Better counting of file sizes
Better counting of file sizes

This now only counts each attachment_data row once.

askl56/whitehall,hotvulcan/whitehall,ggoral/whitehall,robinwhittleton/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,ggoral/whitehall,askl56/whitehall,robinwhittleton/whitehall,alphagov/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,ggoral/whitehall,askl56/whitehall,hotvulcan/whitehall,alphagov/whitehall,hotvulcan/whitehall,hotvulcan/whitehall,YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,alphagov/whitehall,askl56/whitehall,alphagov/whitehall