bug#15811: 24.3.50; enhancement request: provide history for *Pp Eval Output*

[Drew Adams]

Consider providing a navigable history for buffer *Pp Eval Output*.
This would be similar to `l' and `r' in *Info* or the [back] and
[forward] links in *Help*.  But instead of adding links to the buffer,
use keys or menu items.

Currently there is not even any undo in *Pp Eval Output*.  It can be
useful to revisit previous evaluation results.

In GNU Emacs 24.3.50.1 (i686-pc-mingw32)
 of 2013-10-19 on LEG570
Bzr revision: 114715 rgm@gnu.org-20131019023520-s8mwtib7xcx9e05w
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking 'CFLAGS=-O0 -g3' CPPFLAGS=-DGLYPH_DEBUG=1'