This is a major change for anybody who has templates. In order to
handle the encoding of directory and filenames correctly for uploads,
page.Base() was added. It required at url.PathUnescape because it uses
page.Name and that used to be escaped before rendering. Instead of
doing that, there's now the actual .Name (unescaped) and
.Path (escaped). This change is only necessary if the name contains
characters that the html/template doesn't escape for
encodePathSegment: semicolon, comma and question-mark. We can ignore
the forward-slash because we don't allow that in page names.
