[m-dev.] Bug in printing variables under {r,m}mdb

[Zoltan Somogyi]

> The printing of live variables during the execution of samples/sort.m
> does not seem to work:
> 
> From event number number 9 until the end, mmdb only prints the internal
> names of the variables. Under rmdb (Rennes Mercury Debugger, waiting to
> find a better name...) it prints variables OK until event 14 and then
> crashes...

The problem does not occur with my recent changes, so it would seem that
it has been fixed, although the fix may not yet have been checked in.

Zoltan.