code review request for saveplace with dired buffer

[Ivan Kanis]

I have attached the patch for saveplace with dired. Let me know if it's
good to be pushed.

I had to modify dired.el a bit. I thought I could move the cursor using
one of dired hook. Unfortunately it moves the cursor after it called its
hooks.
-- 
Recursivity. Call back if it happens again.
    -- BOFH excuse #36

saveplace-dired.patch
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