[discuss] Support for reverse-execution

[Michael Snyder]

 >>> Would not it be better to have a single "reverse" command which
 >>> puts the debugger in "reverse" mode -- making step/stepi/next/nexti
 >>> go backward.
 >>
 >> Daniel, I rest my case ;-)
 >
 > I don't rest mine :-)  I admit I was a little surprised to see
 > someone else suggest it, but I still think it's an awful idea as
 > a user interface.

Make me a third person who thought of it independantly.

Look at it this way -- once we've implemented the reverse-x
command set, adding this would be trivial; just a single
set/show mode variable.  Then we could evaluate both, or even
leave it to the user to choose.