bug#1175: 23.0.60; bookmark code regression

[Chong Yidong]

> Please, please restore the sane behavior of `bookmark-jump-noselect'
> as it was for Emacs 22: it should return a cons (BUFFER . POINT) when
> a bookmark is located.

I discussed with Stefan.  Since bookmark-jump-noselect is an internal
function of bookmark.el, we don't guarantee that its behavior is
unchanged across Emacs versions.  Furthermore, the
bookmark-jump-noselect not only returned (BUFFER . POINT) but also
preserved the current buffer (and point) instead of changing buffer and
moving point, whereas the new version does change buffer and point.  So
it doesn't make sense to change the return value of the new version.