Fixed #14002 -- Updated filesize filter to support terabyte and petabyte file...

Fixed #14002 -- Updated filesize filter to support terabyte and petabyte file sizes. Thanks to Aaron T. Myers for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@13584 bcc190cf-cafb-0310-a4f2-bffc1f526a37