about://history/ should remember our position on each page

[jidanni@xxxxxxxxxxx]

Idea: "s runs the command w3m-history", which should also remember
where the cursor was on the pages we were on.

  Location: about://history/
  List of all the links you have visited in this session.

  WWWOFFLE Index - Last Time Online Pages (0 0 0 0 7 1 2 0
   WWWOFFLE - Interactive Monitor Page (0 0 0 0 7 1 2 0 2
    WWWOFFLE - Control Delete Monitored URLs Page (0 0 0 0
     豐原客運 (0 0 0 0 7 1 2 0 2 9 4 0 0 2 1 0 12 0 0 2 1
      班車時刻表 (0 0 0 0 7 1 2 0 2 9 4 0 0 2 1 0 12 0 0
       豐原-台北 (0 0 0 0 7 1 2 0 2 9 4 0 0 2 1 0 12 0 0

I.e., in the hidden numbers here that we see as we cut and pasted this
into this posting, emacs-w3m should also remember what position we
were on on each page, so when we click a page, we don't just dumbly go to
the top of the page chosen.