bug#4041: 23.0.92; Emacs 23: buffer point is no longer frame-local

[Drew Adams]

> > "multiple persistent working locations" use case is likely to be
> > the most common reason for users to have N > 1 windows displaying
> > the same buffer in a given frame.
> +1
> > an option such that every window tracks the buffer positions of
> > every buffer that it visits, and when switching back to a buffer
> > B that it has already visited, each window displays B at the same
> > position it last displayed B.
> +1

incf