Update's a page's hit counter and displays the value (unless "QUIET" is used as the image prefix). Displays ALTed images (unless "NONE" is used as the image prefix, or it's missing altogether).

Call with: "count count-file {image prefix}"

  Examples:
    This page has been visited:
      <!--#exec cmd="count counter.dat counter-gifs/blue" -->  times.

    This page has been visited:
      <!--#exec cmd="count counter.dat NONE" -->  times.

    This page has been visited:
      <!--#exec cmd="count counter.dat" --$gt  times.

     <!--#exec cmd="count counter.dat QUIET" -->